Breakfast & Brunch
A 12-egg baked frittata transforms brunch into an effortless feast that serves a crowd with minimal effort. The secret lies in balancing rich eggs with bold fillings—think crispy potatoes, caramelized onions, and melted cheese—all baked to golden perfection in one dish.
This recipe delivers restaurant-quality results without requiring advanced skills, making it ideal for both weekend gatherings and weeknight dinners.
The beauty of a frittata is its versatility—swap in your favorite vegetables, proteins, or herbs while keeping the core technique simple. A 375°F oven ensures even cooking, and 30 minutes transforms a few simple ingredients into a hearty, protein-packed meal.
The key is pre-cooking fillings to avoid a soggy center, ensuring every bite is crispy at the edges and creamy inside.
What makes this recipe stand out is its ability to double as breakfast or dinner, served warm with crusty bread or a fresh salad. The 12-egg scale guarantees generous portions, while the flexible fillings let you customize based on dietary preferences or seasonal produce.
No flipping required—just bake, slice, and serve with confidence.
Perfect for brunch crowds, potlucks, or when you crave a hands-off meal that still feels special. The aroma alone will have everyone gathering at the table. Let’s get started—this frittata is about to become your new go-to recipe.
Ingredients for 12 egg baked frittata
Twelve eggs, bold fillings, and one dish that serves a crowd effortlessly—this frittata delivers restaurant-quality results with minimal effort.
| Ingredient | Amount | Notes |
|---|---|---|
| Large Eggs 🥚 | 12 whole | Room temperature for even cooking |
| Yellow Onions 🧅 | 3 whole | Thinly sliced, caramelized |
| Russet Potatoes 🥔 | 2 lb | Diced small, par-cooked |
| Shredded Cheddar Cheese 🧀 | 2 cups | Sharp variety preferred |
| Heavy Cream 🥛 | ½ cup | Full-fat for richness |
| Fresh Spinach 🍃 | 5 oz | Chopped, stems removed |
| Garlic Cloves 🧄 | 6 cloves | Minced, aromatic |
| Salt 🧂 | 1 ½ tsp | Diamond Crystal preferred |
| Black Pepper 🌶️ | 1 tsp | Freshly ground |
| Olive Oil 🫒 | ¼ cup | Extra-virgin, fruity |
| Fresh Parsley 🌿 | ¼ cup | Chopped, for garnish |
| Vegetable Broth 💧 | ½ cup | Low-sodium preferred |
The eggs are the foundation, so quality matters—pasture-raised if possible, but any fresh eggs will work. Costco or local farms often carry the best. For the potatoes, Russets are ideal—they hold up best during baking. Pre-cook them until tender but not mushy; undercooked potatoes will release too much moisture. The caramelized onions should be deep amber, almost jammy—this adds depth that store-bought fillings can't match. If you're short on time, Trader Joe's sells pre-caramelized onions that work perfectly.
No sharp cheddar? Parmesan or Gruyère add complexity, while feta or goat cheese bring tangy brightness. Swap spinach for kale or Swiss chard—just wilt them first. The vegetable broth can be omitted if you prefer a richer texture, but it adds moisture and prevents dryness. For extra protein, fold in crumbled feta or sautéed mushrooms. The parsley is purely for garnish, but if you're out, basil or chives work equally well. Always measure your salt carefully—Diamond Crystal is less dense than table salt, so use exactly what's listed.
This frittata reheats beautifully—350°F for 10 minutes restores crispiness. Store leftovers in the fridge for 4 days, covered tightly to prevent drying. For make-ahead convenience, bake it a day ahead and reheat before serving. The flavor actually improves overnight as the eggs set further. To serve, slice into wedges and garnish with extra herbs. Pair with crusty bread or a fresh salad for a complete meal. The dish keeps well at room temperature for 2 hours if needed.
Why You'll Love This Recipe
- One-Pan Magic: I swear by this—just toss everything in one dish, bake, and walk away. The potatoes soften while the eggs set, and that heavy cream makes it creamy without extra fuss.
- Creamy Cheesy Bliss: That shredded cheddar melts into gooey pockets, and the heavy cream gives it a richness that feels indulgent. Honestly, it’s the kind of dish that makes you want seconds before it even cools.
- Meal Prep MVP: Make it ahead and reheat slices straight from the fridge—no sad, rubbery eggs here. I pack it for lunches all week, and it’s still delicious cold or warmed up.
- Budget-Friendly Feast: A dozen eggs stretch into a hearty meal, and potatoes and onions are cheap staples. Between us, this feeds four for under $10 and leaves me money for actual coffee the next morning.
Step-by-step instructions for 12 egg baked frittata recipe
This method ensures a perfectly set frittata with rich, custardy centers and crispy edges every time.
🍳 Step 1: Par-Cook the Potatoes and Caramelize the Onions
Begin by par-cooking the 2 lb russet potatoes in boiling salted water for 8-10 minutes until fork-tender but not falling apart. Drain thoroughly and set aside. This partial cooking prevents a watery frittata while ensuring tender potatoes.
In a large oven-safe skillet, heat 0.25 cup olive oil over medium-low heat. Add the 3 whole yellow onions and cook for 15-20 minutes until deeply caramelized—edges should be golden brown and edges should pull away from the pan. This step develops complex sweetness that carries through the entire dish.
👨🍳 Step 2: Prepare the Egg Mixture and Layer Ingredients
In a large bowl, whisk together the 12 whole large eggs, 0.5 cup heavy cream, 1.5 tsp salt, and 1 tsp black pepper until fully combined. The mixture should be smooth with no streaks of egg white remaining. Room temperature eggs incorporate more evenly, so ensure they've been at room temperature for at least 30 minutes.
In the same skillet used for onions, add the par-cooked potatoes and 6 cloves minced garlic. Cook for 3-4 minutes until the potatoes are heated through and garlic is fragrant. Remove from heat and stir in the 5 oz chopped fresh spinach until just wilted. Spread this potato mixture evenly across the bottom of the skillet.
🥘 Step 3: Assemble and Bake the Frittata
Pour the egg mixture evenly over the potato-spinach layer, gently tilting the skillet to distribute it completely. Sprinkle the 2 cups shredded cheddar cheese evenly over the top. The cheese should melt into the eggs during baking rather than forming a separate layer.
Transfer the skillet to a preheated 375°F oven and bake for 25-30 minutes until the top is golden brown and the edges are set but the center still has slight custardy resistance. The frittata is ready when it springs back slowly when gently pressed in the center—it should not be completely firm like a quiche.
🔥 Step 4: Broil for Color and Finish with Broth
Increase oven temperature to broil and place the frittata on the middle rack. Broil for 2-3 minutes until the top develops a deep golden brown crust. Watch carefully to prevent burning—you want color, not char.
Remove from the oven and immediately pour 0.5 cup vegetable broth evenly over the top. Return to the oven for 1-2 minutes to allow the broth to steam and create a moist, custardy center. This final step ensures the frittata remains tender even after resting.
🍽️ Step 5: Rest and Serve with Fresh Garnish
Let the frittata rest for 5-10 minutes before slicing. This resting period allows the internal structure to set properly and makes clean slicing easier. The frittata should hold together when cut, with a firm exterior and a slightly runny center that sets as it cools.
Garnish with 0.25 cup chopped fresh parsley before serving. The parsley adds freshness and visual appeal, balancing the rich cheddar and creamy egg. Serve warm with crusty bread or a simple green salad for a complete meal that satisfies a crowd.
Pro Tips For Making 12 Egg Baked Frittata
- Preheat Pan Like It’s 1987: I learned this the hard way—cold pans and 12 eggs don’t mix. Get your oven to 375°F and heat your 10-inch oven-safe skillet on the stovetop over medium-high for 3-4 minutes first. The potatoes and onions will release moisture faster than you can say "soggy frittata," and a screaming-hot pan ensures that first critical crust forms before the eggs set.
- Slice Potatoes Paper-Thin: Russets are your friend here, but thick slices mean uneven cooking. Grab a sharp knife and slice those potatoes as thin as you can without making them disappear—about ⅛-inch thick. Toss them in cold water for 5 minutes to remove excess starch, then drain well. This stops them from turning to mush and guarantees they’ll crisp up in the oven instead of turning to glue.
- Whisk Eggs with Cream First: Sounds weird, but it works: beat the 12 eggs and ½ cup heavy cream together before adding cheese or salt. The cream emulsifies with the eggs, making the final texture richer and more cohesive. Add the cheese last—it’ll melt into the mix evenly, not clump like it does when tossed in dry. (Yes, even if you’re impatient like me.)
- Cover with Foil Early: The first 15 minutes of baking are where the magic—or the disaster—happens. Once the edges look set but the center’s still jiggly, slap a sheet of foil loosely over the top. This traps steam and keeps the cheese from overbrowning before the middle’s done. Remove it for the last 5 minutes to let the top crisp up—your future self will thank you.
Serving suggestions for this recipe
Brunch Spread Essentials
Start with a crusty baguette or sourdough—I love Boudin Bakery loaves from the grocery store. Warm it slightly in the oven before serving to enhance the frittata's richness.
For a lighter touch, add a mixed greens salad with lemon vinaigrette—toss 4 cups baby arugula with 2 tbsp olive oil and 1 tbsp fresh lemon juice. The peppery bite cuts through the creamy eggs beautifully. 🥖
Dinner Pairings
Transform your frittata into a full dinner by pairing it with roasted Brussels sprouts—toss 1 lb Brussels sprouts with 1 tbsp olive oil, ½ tsp smoked paprika, and roast at 425°F for 20 minutes. The caramelized edges add a smoky contrast.
For a heartier option, serve with garlic mashed potatoes—whisk 2 lbs Yukon Gold potatoes with ½ cup butter and 4 cloves roasted garlic. The creamy texture complements the frittata's crisp edges. ✨
Make-Ahead Serving
If baking ahead, reheat slices in a 350°F oven for 10 minutes—this restores crispiness without drying out.
For a buffet-style brunch, arrange slices on a platter with pickled red onions (quick-pickle 1 red onion in ½ cup vinegar and 1 tbsp sugar for 30 minutes) and hot sauce for customization. The tangy onions add a bright contrast to the rich frittata.
For a lunchbox-friendly version, wrap slices in parchment paper with a side of hummus and whole-grain crackers. 💡
Global Twist Variations
Give your frittata an Italian touch by adding sun-dried tomatoes and fresh basil—fold ½ cup chopped sun-dried tomatoes into the egg mixture and garnish with ¼ cup torn basil after baking.
For a Mexican-inspired version, swap cheddar for Monterey Jack and add black beans and corn to the potato layer. Serve with avocado slices and lime wedges for a zesty finish. 🌎
Presentation Tips
Slice the frittata into even wedges using a sharp chef's knife—angle the knife slightly for clean cuts. Arrange slices on a wooden board or slate platter for rustic charm. Drizzle with extra-virgin olive oil and sprinkle with flaky sea salt right before serving.
For a gourmet touch, add edible flowers or microgreens—I love nasturtiums for their peppery bite. The presentation elevates the dish from weeknight meal to showstopper. 💫
Nutrition facts
Frequently asked questions
Can I make this frittata in a smaller pan?
Yes, but you'll need to adjust the baking time and temperature. Use a 10-inch oven-safe skillet and bake at 350°F for 25-30 minutes instead of 375°F. The smaller surface area means gentler heat, so watch closely to prevent overcooking. For best results, reduce the egg quantity to 8 eggs to maintain the same thickness.
Why is my frittata rubbery or undercooked?
Undercooked centers usually happen from insufficient baking time or too much liquid in fillings. Ensure your oven is properly calibrated (use an oven thermometer) and bake until the center just sets—it should spring back slowly when pressed. For soggy textures, par-cook potatoes thoroughly and avoid overloading with wet ingredients like raw onions or un-drained greens.
How do I store leftovers without drying out?
Wrap slices tightly in plastic wrap or store in an airtight container with parchment paper between layers. Reheat individual portions in a 350°F oven for 10 minutes with a splash of water or broth to restore moisture. Leftovers keep well in the fridge for 4 days or freeze for 2 months—thaw overnight in the fridge before reheating.
Can I add meat to this vegetarian frittata?
Cook ½ lb ground sausage or diced ham with the potatoes until fully browned before adding to the skillet. For chicken, use 1 cup shredded rotisserie chicken—just heat it through before mixing. Brown meat first to remove excess fat and prevent a greasy texture. The cooking time remains the same as the recipe calls for.
What's the best way to slice a baked frittata?
Let it rest for 10 minutes first—this helps the structure set. Use a sharp chef's knife and angle it slightly to create clean wedges. For even slices, draw a pencil line around the pan first as a guide. Serve immediately for the best texture, as the interior will firm up slightly as it cools.