Italian Frittata

Preheat the oven

Position an oven rack in the upper-middle position and preheat the oven to 375°F (190°C).

Make the egg mixture

Crack all 8 eggs into a large bowl.

Add the milk, half the Parmigiano-Reggiano, salt, pepper, and Italian seasoning to the eggs.

Whisk vigorously until the mixture is uniform and slightly frothy, about 30 seconds.

Sauté the onion

Heat the olive oil in a 10-inch oven-safe skillet over medium heat until shimmering.

Add the sliced onion to the skillet.

Cook, stirring occasionally, until the onion softens and turns golden, about 5 minutes.

Cook the zucchini

Add the zucchini slices to the skillet in a single layer.

Cook without stirring for 2 minutes until lightly browned on one side.

Stir and continue cooking until zucchini is just tender, about 2 more minutes.

Add aromatics

Add the minced garlic to the skillet and stir for 30 seconds until fragrant.

Add peppers and tomatoes

Scatter the roasted red pepper strips and sun-dried tomatoes over the vegetables.

Stir everything together and spread the mixture into an even layer across the bottom of the skillet.

Add the egg mixture

Reduce the heat to medium-low.

Pour the egg mixture evenly over the vegetables in the skillet.

Drop small spoonfuls of ricotta across the top of the egg mixture.

Stovetop cook

Cook on the stovetop without stirring until the edges are set but the center still jiggles, about 3 to 4 minutes.

Use a spatula to gently lift the edges and check that the bottom is not burning.

Finish in the oven

Sprinkle the remaining Parmigiano-Reggiano evenly over the top.

Transfer the skillet to the preheated oven.

Bake until the top is golden and the center is fully set, about 8 to 10 minutes.

Check doneness

Gently shake the skillet — if the center no longer jiggles, the frittata is done.

Rest and serve

Remove the skillet from the oven using oven mitts and let the frittata rest for 3 minutes.

Scatter the torn fresh basil leaves over the top.

Slice into wedges directly in the skillet and serve warm or at room temperature.