The Best Frittata Recipe

Preheat your oven to 375°F (190°C).

In a large bowl, whisk together the eggs, milk, salt, and black pepper until well combined.

Heat olive oil in an oven-safe skillet over medium heat. Add the diced onion and sauté for 3-4 minutes until tender.

Add the spinach and cherry tomatoes to the skillet and cook for another 2-3 minutes, until the spinach is wilted.

Pour the egg mixture into the skillet and let cook undisturbed for 2-3 minutes. Sprinkle mozzarella and parmesan cheese evenly over the top.

Transfer the skillet to the oven and bake for 15-18 minutes, or until the frittata is set and slightly golden. Let cool for a few minutes before slicing and serving.