Preheat oven to 375°F.
In a medium bowl, whisk together eggs, milk, salt, and pepper. Stir in parsley and basil.
Heat olive oil in a 10-inch oven-safe skillet over medium heat.
Add garlic scapes and zucchini. Cook for 3-4 minutes until slightly softened.
Add spinach and cook until wilted, about 1 minute.
Spread vegetables evenly in the skillet and pour the egg mixture over top.
Sprinkle with tomatoes and feta cheese, if using.
Cook undisturbed for 2-3 minutes until the edges begin to set.
Transfer skillet to the oven and bake for 12-15 minutes, or until the center is set and lightly golden.
Allow to cool for 5 minutes before slicing.