01 - Preheat your oven to 375°F (190°C).
02 - In a large ovenproof skillet, heat 1 tablespoon olive oil over medium heat. Add the pancetta and cook until crisp, about 3–4 minutes. Remove with a slotted spoon and set aside.
03 - Add the remaining olive oil to the skillet. Sauté the chopped onion for 2 minutes until translucent. Add the zucchini and cook for 5–6 minutes, stirring occasionally, until tender but not mushy.
04 - In a large bowl, whisk together eggs, milk, Parmesan, parsley, basil, salt, and pepper.
05 - Add the cooked pancetta back to the skillet with the vegetables. Pour the egg mixture over the contents in the skillet, gently stirring to distribute evenly.
06 - Cook on the stove over medium heat for 3–4 minutes, until the edges start to set.
07 - Transfer the skillet to the preheated oven and bake for 8–10 minutes, or until the center is just set and the top is lightly golden.
08 - Let cool for a few minutes before slicing. Serve warm or at room temperature.