Leftovers Oven Baked Frittata

1: Preheat the oven to 375°F.

2: In a bowl, combine the eggs, milk, seasonings, and shredded mozzarella to make the custard. Set aside.

3: Assemble all your add-ins.

4: In a large oven-proof skillet, heat 2 tablespoons of olive oil and add the add-ins to warm them up. Season with salt and pepper.

5: Pour the custard over the add-ins and cook for about 5 minutes without stirring.

6: Transfer the skillet to the oven and bake for 25-30 minutes, or until golden and solid in the center.

7: Let cool slightly before slicing. Serve as is, or as a sandwich with a slice of tomato, and optionally drizzle with marinara.