In a medium bowl, whisk together the eggs, sour cream, and shredded cheese until smooth. Season with salt, black pepper, and Italian-style herbs.
Arrange the prepared vegetables evenly over the crust. Lightly season with additional salt and pepper. Pour the egg mixture evenly over the vegetables.
Bake for 35–40 minutes, or until the center is set and the top is lightly golden. Let the quiche rest for about 10 minutes before slicing and serving.