- Preheat the grill, setting the burners on high or, with the rack in the highest position, preheat the oven’s broiler.
- Brush the bread slices with oil on both sides and grill or toast on a baking sheet in the oven.
- Rub one side of each toasted bread slices with the garlic. Cover with the slices of tomato and avocado. Season with salt and pepper. Garnish with Parmesan cheese shavings.