Special equipment: 24 small skewers or toothpicks
Preheat the oven to 400 degrees F. Line a baking sheet with parchment paper. In a large bowl, toss the bread cubes with 2 tablespoons of the oil, the Parmesan, garlic powder, 1/2 teaspoon of the salt and 1/4 teaspoon of the pepper. Bake until golden brown, 5 to 7 minutes.
Slice the basil leaves in half lengthwise. To assemble skewers, thread with a bread cube, piece of basil leaf, tomato half and piece of cheese. Place the finished skewers on a platter. Drizzle with the remaining 2 tablespoons of oil and sprinkle with the remaining 1/2 teaspoon salt and 1/4 teaspoon pepper.