Preheat the oven to 375°F. Grease a 9-inch pie pan (or line it with parchment paper).
Saute chosen vegetables with salt and pepper until cooked completely.
Add the veggie mixture to the batter. Pour the frittata mixture into the prepared pie pan and bake for 30-40- minutes, or until a toothpick inserted in the center comes out almost clean. The top will crack and get golden.
Allow the frittata to cool for 10 minutes before serving.
Enjoy warm or at room temperature!