Heat a grill pan over medium-high heat. Preheat broiler. Grill bread on both sides until browned.
Rub around the crust of each slice of bread with garlic. Transfer bread to a baking sheet. Drizzle 1 side of each slice with oil. Spread tomato sauce evenly over bread. Top each slice with cheese. Place under broiler until melted.
Serve immediately topped with basil leaves.
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