Eggplant, tomatoes, and mozzarella fill up a hungry bunch without breaking the bank. Fresh basil is the perfect way to brighten up rich flavors.
Heat a grill or grill pan to medium-high. Clean and lightly oil hot grill. In a small bowl, combine garlic with 1 tablespoon oil; season with salt and pepper. Brush garlic oil on cut sides of bread and grill until lightly toasted on both sides, 1 to 2 minutes. Top bottom half with cheese.
Brush eggplant with 1 tablespoon oil and season with salt and pepper. Grill until tender and lightly charred, 12 to 15 minutes, flipping once. Layer eggplant on cheese. Brush tomatoes with 1 tablespoon oil and season with salt and pepper. Grill until lightly charred, 2 to 3 minutes, flipping once. Layer tomatoes on eggplant, top with basil, and sandwich with top half of bread. Cut crosswise into 4 pieces and serve.