Heat a grill pan over medium-high heat. Brush 2 tablespoons of olive oil over the bread slices. Grill the bread until golden brown, about 2 minutes per side.
Stir the goat cheese, ricotta cheese, basil, lemon peel, and remaining 1 tablespoon of oil in a small bowl until smooth and creamy. Season, to taste, with salt and pepper. Spread the cheese mixture over the crostini. Arrange the toasts on a platter and serve.