Combine olive oil and garlic, brushing on to one side of each piece of bread. Broil until slightly toasted, taking out of the oven.
Turn each piece of bread over, laying down a tomato slice, then a thin piece of mozzarella cheese, broiling another 2 minutes, until lightly brown.
Transfer bites to a platter, and sprinkle basil on top. Salt and pepper to taste. Option: Use a balsamic drizzle (or let your guests drizzle their own).