This tomato basil frittata is like a crustless quiche, and it is super simple to make.
¼ cup diced onion (I used sweet yellow onions)
½ cup milk (I used 1%)
½ teaspoon salt
¼ teaspoon black pepper
1 cup shredded part skim mozzarella, divided
1 cup sliced tomatoes
10 to 15 fresh basil leaves