Serve this Italian egg dish to weekend guests.
Heat oven to 350°F. Combine milk, onion, eggs, basil, salt and pepper in medium bowl.
Melt butter in 10-inch ovenproof skillet until sizzling; add garlic. Cook over medium heat until garlic is tender (2 to 3 minutes). Pour egg mixture into skillet.
Bake for 8 to 10 minutes or until egg mixture is partially set. Remove from oven.
Arrange zucchini slices in circle on top of egg mixture; place tomato slices on top of zucchini. Sprinkle with mozzarella and Parmesan cheese. Continue baking for 10 to 14 minutes or until cheese is melted and eggs are set.