A Frittata is an Italian way to use up leftover ingredients and to make a quick meal or snack. Unlike an American omelet, they're not usually eaten at breakfast. In fact, they are probably eaten more often as a snack or as a portable sandwich for a road trip or train ride. This one is made with zucchini from the garden; if yours have flowers - throw them in too!
Heat the oil in an 8- to-10-inch nonstick saute pan over medium heat. Add the shallots and zucchini and cook until just beginning to soften, 3 to 4 minutes.
Meanwhile, beat the eggs with the milk. Add the Parmigiano and sprinkle with salt and pepper. Stir until combined.
When the zucchini have softened, remove the pan from the heat and add the zucchini to the eggs. Stir to combine.
Add the butter to the same pan and swirl to melt. Add the egg and zucchini mixture and top with the torn zucchini flowers if using. Cover the pan and cook over medium-low heat until the edges of the frittata begin to brown and the center has set and is puffed slightly, about 8 minutes.
To serve, turn the frittata out onto a cutting board top-side-up. Slice and eat with Tuscan bread.