In a small pan, heat olive oil on medium-low heat.
Saute crushed garlic in olive oil for 10 minutes. Remove from heat.
Split each bun in half and brush with olive oil and garlic mix. Top with salt and pepper.
In a large baking pan, lightly toast the buns in preheated oven, oiled side up, for 3 to 5 minutes and then remove.
Heat oven to broil.
Mix together diced tomatoes, onions, basil and olive oil in a bowl. Season with salt and pepper.
Evenly distribute mozzarella and shredded Parmesan over each bun half. Place in oven for 5 to 7 minutes till cheese melts and starts to brown. Remove from oven.
Evenly sprinkle the diced tomato mix over each bun half.
Top with balsamic glaze or serve with side of marinara for dipping.
