Heat oven to 400° F. Scoop out the inside of each tomato half with a melon baller and roughly chop the scooped pulp. Combine tomato pulp, mozzarella, basil, Parmesan, garlic, and a pinch of salt and pepper.
Place tomatoes, cut side up, on a baking sheet. Spoon in tomato mixture and bake until cheese is melted and lightly browned, about 10 minutes. Serve warm.
by The Savvy Kitchen