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A frittata is the quiet hero of the weeknight kitchen: eggs, whatever vegetables are in the drawer, and a skillet that goes straight from the stove to the oven. This Rainbow Veggie Frittata starts with thin-sliced Yukon Gold potato, builds in sweet red onion and bell pepper, and finishes with burst cherry tomatoes and briny feta. Cut into six fat wedges, it looks like a celebration and costs about the same as a pizza.
The trick is in the heat, not the ingredients. A short stint on the stovetop over medium heat (350°F/175°C) sets the bottom so it releases cleanly, and a 375°F (190°C) oven puffs the middle into a custard that stays tender instead of turning into a rubbery omelet. Pull it at 160°F (71°C) and the slices hold their shape on the plate.
Serve it warm for dinner with a green salad, or at room temperature the next morning with strong coffee. It travels beautifully, holds for three days, and reheats in less than a minute.
Why You'll Love This Recipe
About the Ingredients
8 large eggs
Large eggs give the custard its structure; buy the freshest you can find and check each one for cracks before whisking. If you want to serve 8 people, add 2 extra eggs plus 2 tablespoons of milk instead of stretching the pan.
1/2 cup (120 ml) whole milk
Whole milk keeps the texture silky; 2% works fine and half-and-half makes it richer. Skip skim milk, which makes the eggs taste rubbery.
1 medium Yukon Gold potato (about 8 oz/225 g), peeled and sliced 1/8 inch thick
Yukon Golds turn buttery and hold their shape; a mandoline gets the slices thin and even so they finish cooking in the oven. Red potatoes or a small peeled sweet potato are good swaps.
2 tablespoons olive oil
Regular olive oil, not extra-virgin, handles medium heat better; avocado oil or ghee work the same way. Buy a mid-priced bottle for cooking and save the fancy oil for drizzling.
1 small red onion, thinly sliced (about 1 cup/100 g)
Red onion adds mild sweetness and a pretty purple edge; yellow onion or 3 sliced scallions are fine substitutes. Soak the slices in cold water for 5 minutes if raw onion flavor bothers you.
1 red bell pepper, stemmed and diced (about 1 cup/150 g)
Choose a pepper that feels heavy for its size with glossy, unwrinkled skin. Drained jarred roasted red peppers save about 5 minutes of prep and add a smoky note.
2 cups (60 g) baby spinach, roughly chopped
Baby spinach wilts in seconds and needs no stemming; frozen chopped spinach works if you thaw and squeeze it bone-dry first. Chopped kale works too but needs 3 extra minutes in the pan.
1 cup (150 g) cherry tomatoes, halved
Set them cut-side up on the frittata so they roast into sweetness instead of steaming. Grape tomatoes or a well-drained 14-ounce can of diced tomatoes are easy substitutes.
3/4 cup (about 4 oz/112 g) crumbled feta
Buy feta packed in brine rather than pre-crumbled for creamier texture and better flavor. Goat cheese, ricotta salata, or shredded Gruyère are excellent stand-ins.
1/2 teaspoon fine sea salt
Fine sea salt dissolves evenly into the eggs; if you only have kosher salt, use 3/4 teaspoon. Taste the raw egg mixture before it hits the pan — it should be lightly but clearly seasoned.
1/4 teaspoon freshly ground black pepper
Fresh-cracked pepper blooms in the warm eggs and stays fragrant. White pepper is a milder swap if anyone at the table objects to black flecks.
2 tablespoons torn fresh basil, for serving
Torn basil adds a fresh finish; parsley or chives are milder swaps and 1/2 teaspoon dried oregano works when fresh herbs have wilted. Add it after baking so it stays bright green.
Tips & Tricks
Mistake 1 — wet vegetables
Watery spinach or tomatoes steam in the pan and make the custard weep. Pat everything dry and use whole milk, not skim.
Mistake 2 — heat too high
Eggs cooked above medium (350°F/175°C) go rubbery and brown before the center sets. Drop to medium-low (300°F/150°C) the moment the egg mixture goes in.
Mistake 4 — slicing too soon
Cutting after 2 minutes smears the layers together. Give it the full 5-minute rest and the wedges come out clean.
- Mistake 3 — a pan that cannot take the oven: A plastic-handled skillet will melt at 375°F (190°C). Use a cast-iron or stainless skillet, or wrap the handle in two layers of foil.
Pro Tips
Step-by-Step Instructions
1. Heat the Oven
Preheat the oven to 375°F (190°C) with a rack in the middle. Whisk the eggs, milk, salt, and pepper in a large bowl for 60 seconds, until the mixture is completely uniform and slightly frothy at the edges.
2. Brown the Potato
Warm 1 tablespoon of the olive oil in a 10-inch oven-safe skillet over medium heat (350°F/175°C) for 2 minutes, until a drop of water sizzles on contact. Add the potato slices in a single layer and cook 6 minutes per side, until the edges are golden brown and a knife slides through with no resistance.
3. Soften the Vegetables
Push the potatoes to the edge of the pan, add the remaining 1 tablespoon of oil, the onion, and the bell pepper. Cook for 5 minutes at that same 350°F (175°C), stirring occasionally, until the onion looks translucent and the pepper is glossy-soft.
4. Wilt the Spinach
Stir in the spinach and cook 90 seconds, just until it collapses and turns deep green. Spread everything into one even layer so the custard sets flat.
5. Pour in the Eggs
Reduce the heat to medium-low (300°F/150°C) and pour the egg mixture evenly over the vegetables. Scatter the cherry tomatoes cut-side up and the feta over the top, then let it set undisturbed for 3 minutes, until the outer inch of egg looks opaque.
6. Bake Until Puffed
Slide the skillet into the oven and bake 18 to 22 minutes at 375°F (190°C), until the center registers 160°F (71°C) on an instant-read thermometer and the top is puffed, set, and golden at the edges.
7. Rest in the Pan
Take the skillet out and let the frittata rest 5 minutes. It will deflate slightly and pull away from the sides, which is exactly what makes it easy to release.
8. Release and Slice
Run a silicone spatula around the rim, slide the frittata onto a cutting board, scatter with torn basil, and cut into 6 wedges. Serve warm or at room temperature.
Delicious Variations
Tex-Mex Frittata
Swap the feta for pepper Jack, add 1/2 teaspoon ground cumin to the eggs, and finish with salsa, avocado, and cilantro.
Greek Garden Frittata
Replace the potato with 1/2 cup chopped Kalamata olives and 1/4 cup chopped sun-dried tomatoes, then shower the top with fresh dill.
Smoked Salmon and Dill Frittata
Fold 4 ounces of flaked cold-smoked salmon and 2 tablespoons chopped dill into the eggs just before baking and leave out the feta.
How to Store Rainbow Veggie Frittata
Refrigerator
Cool the frittata to room temperature, then store wedges in an airtight container in the fridge for up to 3 days. Layer paper towels between wedges if you stack them.
Freezer
Wrap each cooled wedge tightly in plastic wrap, then in foil, and freeze for up to 2 months. Label with the date so you can grab a quick breakfast later.
Reheating
Microwave a single wedge for 45 to 60 seconds on high, or reheat loosely covered at 300°F (150°C) for 8 to 10 minutes from frozen. Stop as soon as it is hot through so the eggs do not toughen.
Rainbow Veggie Frittata – Easy 30-Minute One-Pan Meal
Rainbow Veggie Frittata bakes in one pan in 25 minutes, giving you a protein-packed, veggie-loaded dinner with almost no cleanup on a weeknight.
🧂 Ingredients
- 8 large eggs
- 1/2 cup (120 ml) whole milk
- 1 medium Yukon Gold potato (about 8 oz/225 g), peeled and sliced 1/8 inch thick
- 2 tablespoons olive oil
- 1 small red onion, thinly sliced (about 1 cup/100 g)
- 1 red bell pepper, stemmed and diced (about 1 cup/150 g)
- 2 cups (60 g) baby spinach, roughly chopped
- 1 cup (150 g) cherry tomatoes, halved
- 3/4 cup (about 4 oz/112 g) crumbled feta
- 1/2 teaspoon fine sea salt
- 1/4 teaspoon freshly ground black pepper
- 2 tablespoons torn fresh basil, for serving
📋 Instructions
- 1Heat the Oven — Preheat the oven to 375°F (190°C) with a rack in the middle. Whisk the eggs, milk, salt, and pepper in a large bowl for 60 seconds, until the mixture is completely uniform and slightly frothy at the edges.
- 2Brown the Potato — Warm 1 tablespoon of the olive oil in a 10-inch oven-safe skillet over medium heat (350°F/175°C) for 2 minutes, until a drop of water sizzles on contact. Add the potato slices in a single layer and cook 6 minutes per side, until the edges are golden brown and a knife slides through with no resistance.
- 3Soften the Vegetables — Push the potatoes to the edge of the pan, add the remaining 1 tablespoon of oil, the onion, and the bell pepper. Cook for 5 minutes at that same 350°F (175°C), stirring occasionally, until the onion looks translucent and the pepper is glossy-soft.
- 4Wilt the Spinach — Stir in the spinach and cook 90 seconds, just until it collapses and turns deep green. Spread everything into one even layer so the custard sets flat.
- 5Pour in the Eggs — Reduce the heat to medium-low (300°F/150°C) and pour the egg mixture evenly over the vegetables. Scatter the cherry tomatoes cut-side up and the feta over the top, then let it set undisturbed for 3 minutes, until the outer inch of egg looks opaque.
- 6Bake Until Puffed — Slide the skillet into the oven and bake 18 to 22 minutes at 375°F (190°C), until the center registers 160°F (71°C) on an instant-read thermometer and the top is puffed, set, and golden at the edges.
- 7Rest in the Pan — Take the skillet out and let the frittata rest 5 minutes. It will deflate slightly and pull away from the sides, which is exactly what makes it easy to release.
- 8Release and Slice — Run a silicone spatula around the rim, slide the frittata onto a cutting board, scatter with torn basil, and cut into 6 wedges. Serve warm or at room temperature.
