Heat a cast iron or nonstick skillet over medium heat. Mix cheese, basil leaves, and pizza sauce together in a bowl. Set aside.
Spread 1 teaspoon mayonnaise on each slice of bread. Place bread slices mayo-side-down in the hot skillet. Spread cheese mixture on 1 slice of bread. Cook until bread turns golden brown and cheese melts, 3 to 5 minutes. Place second slice of bread on top of cheese mixture, grilled side up.
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