01 - Preheat oven to 375°F.
02 - Heat 1 tablespoon olive oil in a large ovenproof skillet over medium heat. Add diced pancetta and cook until crisp, about 3-4 minutes. Remove with slotted spoon and set aside.
03 - Add remaining olive oil to skillet. Sauté chopped onion for 2 minutes until translucent. Add zucchini and cook for 5-6 minutes, stirring occasionally, until tender but not mushy.
04 - Whisk together eggs, milk, Parmesan, parsley, basil, salt, and pepper in a large bowl until well combined.
05 - Return cooked pancetta to skillet with vegetables. Pour egg mixture over skillet contents, gently stirring to distribute evenly.
06 - Cook over medium heat for 3-4 minutes until edges begin to set.
07 - Transfer skillet to preheated oven and bake for 8-10 minutes until center is just set and top is lightly golden.
08 - Let cool for a few minutes before slicing. Serve warm or at room temperature.