Spanish Egg Omelette Recipe: Tortilla Española With Perfectly Runny Yolk

This Spanish egg omelette recipe delivers the perfect tortilla española with its signature creamy texture and runny yolk—exactly as they serve it in Spain. The secret lies in layering thinly cooked potatoes and onions between eggs that cook just until set, creating that signature custardy center.

I've perfected this technique over years of testing, and the results are always restaurant-quality at home.

The beauty of this dish is its simplicity—just six ingredients transform into a meal that's equally at home as a tapas appetizer or a hearty main course. Thinly slicing the potatoes and onions ensures even cooking, while the eggs bind everything together into a single, golden-brown patty.

The key is patience: letting the tortilla rest before flipping guarantees that creamy interior we all crave.

What makes this recipe truly special is that perfect balance of textures—crisp edges, tender potatoes, and that molten yolk that pools when you cut in. It's a dish that improves with leftovers, developing even deeper flavor as it sits.

Once you master this technique, you'll never settle for anything less than authentic Spanish tortilla again.

Serve it warm with a sprinkle of paprika or as part of a larger paella spread, or enjoy it cold in sandwiches the next day. The possibilities are endless, but the foundation remains the same: thinly cooked layers that create that signature runny yolk experience.

Let's get started on making it perfectly.

Ingredients for spanish egg omelette

Six simple ingredients create the perfect Spanish tortilla with that signature runny yolk.

The potatoes and onion are your foundation—Russet potatoes work best because they stay firm when cooked thin. Grab a mandoline slicer if you've got one, but a sharp knife works too (just be patient). Soak the slices in cold water for 10 minutes to remove excess starch—they'll crisp up beautifully when fried. Yellow onions should be thinly sliced too, same thickness as the potatoes. If you're at Whole Foods, grab their organic potatoes—they slice cleaner. For the onion, any yellow variety works, but avoid red if you don't want color bleeding.

No mandoline? Use a sharp knife and steady hand. The slices don't need to be perfect, just consistent. Fresh out of potatoes? Sweet potatoes work in a pinch, but they'll add sweetness to the dish. The olive oil matters here—high-quality extra-virgin gives better flavor than the cheap stuff. No extra-virgin? Any neutral oil (like vegetable or canola) works, but you'll lose that fruity depth. The salt and pepper are simple, but freshly ground black pepper makes a difference—pre-ground loses its punch fast. Want more flavor? Add a pinch of smoked paprika to the eggs before cooking.

Potatoes and onions keep 5-7 days in the fridge, but use them within 3 days for best texture. The eggs? Freshest possible—they should float in cold water if you're unsure. This tortilla actually tastes better the next day (that's the magic of Spanish tortilla), so make extra. Store leftovers in the fridge for up to 4 days—reheat gently in a skillet to restore that creamy texture. For sandwiches, slice thick and toast lightly in butter—absolute game-changer.

Step-by-step instructions for Spanish egg omelette with perfectly runny yolk

Here's how to make the classic Spanish tortilla with that signature creamy center.

Peel the 2 medium russet potatoes and slice them into ⅛-inch thick rounds using a mandoline or sharp knife. Transfer them to a colander and soak in cold water for 15 minutes—this removes excess starch that would make your omelette gummy. Drain well before using.

Cut the 1 whole yellow onion in half and slice it into thin half-moons, matching the thickness of the potato slices. The uniform thickness ensures even cooking throughout the omelette. Pat both the potatoes and onions dry with a clean kitchen towel to remove any remaining moisture.

Heat the 0.25 cup extra-virgin olive oil in a 10-inch nonstick skillet over medium heat. Add the drained potatoes and onions, spreading them out in a single layer. Cook for 8-10 minutes, stirring occasionally, until the potatoes are tender but not browned—they should still hold their shape when pierced with a fork.

Here's the thing—you want them cooked through but still with a slight bite. If they start to brown too quickly, reduce the heat slightly. Remove the vegetables from the skillet and set them aside on a paper towel-lined plate to drain any excess oil.

In a large bowl, crack all 6 whole large eggs and add the 1 tsp salt and 0.25 tsp ground black pepper. Whisk them vigorously with a fork or whisk until the yolks and whites are completely combined and the mixture is uniform in color. This step is crucial—unevenly mixed eggs can lead to a dense omelette instead of that signature creamy texture.

Add the cooked potatoes and onions to the egg mixture and gently fold them in with a spatula, being careful not to break up the vegetables too much. Let the mixture sit for 5 minutes to allow the flavors to meld together. The potatoes will begin to absorb some of the egg liquid, which helps create that perfect texture.

Wipe out the skillet with a paper towel to remove any excess oil, then return it to medium heat. Pour in the egg and potato mixture, tilting the pan to spread it evenly. Cook for 4-5 minutes without stirring, until the edges start to set and the bottom is lightly golden. You'll see the edges begin to pull away from the pan—that's your signal to flip.

To flip, place a large plate over the skillet and quickly invert both onto the plate. Slide the omelette back into the skillet to cook the second side for another 4-5 minutes, again until golden brown. The center should still be slightly runny when you cut into it—this is what makes the Spanish omelette special.

Remove the omelette from the skillet and let it rest on a cutting board for 5 minutes. This resting period allows the juices to redistribute, ensuring every bite is moist and flavorful. Cut into wedges and serve warm—each piece should have that perfect balance of creamy egg center and tender potato.

For the best experience, serve immediately with a simple green salad or crusty bread. The omelette will continue to set slightly as it cools, but the center should remain wonderfully runny. Leftovers can be reheated gently in a skillet or oven, but they won't be quite as creamy as when first made.

Common mistakes when making this recipe

Overcooking the Eggs

The biggest mistake I see is letting the eggs cook too long, which turns that perfect runny yolk into a dry, rubbery mess. The key is to stop cooking when the edges are just set but the center remains slightly wobbly—about 4-5 minutes per side.

I’ve ruined more tortillas than I’d admit by keeping them in the pan too long, thinking they needed more time. Trust your instincts: when the edges lift easily and the top looks lightly golden, it’s time to flip. 🌡️

Skipping the Resting Time

Rushing to cut into the tortilla immediately after cooking is another common error. Letting it rest for 5 minutes allows the juices to redistribute, ensuring that creamy texture throughout.

I once cut into one too soon and was met with a sad, dry center. The resting period is non-negotiable—it’s what separates a good tortilla from a great one.

Uneven Potato Cooking

Some people either undercook or overcook the potatoes before mixing them with the eggs. You want them tender but not mushy—they should hold their shape when pierced with a fork. If they’re still crunchy, they’ll make the tortilla dense.

If they’re too soft, the texture will be gummy. I’ve found that 8-10 minutes over medium heat is the sweet spot, and stirring occasionally keeps them from browning.

Not Using Enough Oil

Using too little oil leads to sticking and uneven cooking, while too much makes the tortilla greasy. Stick to the 0.25 cup measurement and heat it properly before adding the potatoes. I like to use a 10-inch nonstick skillet—it gives enough surface area for even cooking.

If the oil isn’t hot enough, the potatoes will steam instead of crisp up, and that’s a texture disaster.

Overmixing the Eggs

Overmixing the eggs after adding the potatoes can create a dense, cake-like texture instead of that signature creamy interior. Once you’ve folded in the vegetables, let the mixture sit for 5 minutes—just enough time for the flavors to meld without overworking the eggs.

I’ve seen people whip this like a meringue, and it’s a crime against the tortilla. Gentle folding is the way to go. ✨

Flipping Too Early

Flipping before the edges are set is a surefire way to end up with a broken tortilla. The edges should be golden and pulling away from the pan before you attempt the flip. I’ve learned this the hard way—once, I flipped too soon and ended up with a lumpy mess.

Use a plate to help with the flip, and go slow. The tortilla should hold together like a single piece when you slide it back into the pan for the second side.

Frequently asked questions