Heat olive oil in a large oven-safe skillet over medium heat. Add onion, garlic, bell pepper, zucchini, Italian seasoning, salt, and black pepper. Cook, stirring occasionally, until vegetables are softened, about 5 minutes.
Stir in pizza sauce and cook for an additional 2 minutes. Remove from heat.
In a large bowl, whisk together eggs and milk. Pour egg mixture over the vegetables in the skillet and sprinkle with cheese.
Bake in preheated oven for 15-20 minutes, or until the top is lightly golden and the center is set.
Remove from oven and let cool for a few minutes before slicing and serving.
Interesting Facts
This Vegetable Pizza Frittata is a great way to use up any extra vegetables you have in the fridge!
You can also add cooked sausage, bacon, or ham to the frittata for added flavor and protein.
This frittata is a great way to get your daily dose of vegetables and protein in one delicious dish!