Learn to sauté vegetables and finish a frittata in the oven, combining skills of sautéing and pan-frying for a delicious dish.

Preheat the oven to 375°F (190°C).
Per serving
In a mixing bowl, whisk together the eggs, milk, salt, and black pepper until well combined.
Heat olive oil in a large oven-safe skillet over medium heat. Add diced onion and bell pepper; sauté for 3-4 minutes until softened.
Add sliced zucchini and continue to sauté for an additional 2-3 minutes until tender.
Stir in the fresh spinach and cook until wilted, about 1 minute.
Pour the egg mixture over the sautéed vegetables in the skillet, gently stirring to combine.
Sprinkle grated parmesan cheese evenly on top.
Transfer the skillet to the preheated oven and bake for 15-20 minutes, or until the eggs are set and the top is golden.
Allow to cool for a few minutes before slicing and serving.