Fresh sliced tomatoes are baked to perfection with layers of fontina cheese, basil, and optional sliced onions.
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Preheat the oven to 425 F.
Butter a shallow baking dish or spray it with nonstick cooking spray.
Remove the stems from the tomatoes and slice them into 1/2-inch rounds. Brush the tomatoes with the melted butter or olive oil.
Layer the tomato slices with the thinly sliced onion (if using), the chopped fresh basil or parsley, and the shredded cheese.
Bake 10 to 15 minutes, or until hot and the cheese has melted.