01 - Preheat oven to 400°F and line a baking sheet with parchment paper.
02 - Toss halved tomatoes with 2 tbsp olive oil, 1/2 tsp sea salt, and 1/4 tsp black pepper; spread cut side up on the prepared baking sheet.
03 - Roast tomatoes for 20 to 25 minutes until soft and caramelized; remove and let cool slightly.
04 - Brush bread slices on both sides with 2 tbsp olive oil, place on a separate baking sheet, and toast in the oven for 6 to 8 minutes, turning once until golden and crisp.
05 - While toast is still warm, gently rub one side of each slice with the peeled garlic cloves.
06 - In a bowl, gently mix roasted tomatoes with chopped basil and balsamic vinegar if using; adjust seasoning with salt and pepper.
07 - Spoon tomato mixture onto garlicky toasts; garnish with additional basil, a drizzle of olive oil, and a sprinkle of salt and pepper; serve immediately.