Preheat the oven to 450°F. Line a large rimmed baking sheet with parchment paper.
In a large bowl, combine tomatoes, garlic, basil, red onions, olive oil, balsamic vinegar, salt and pepper; set aside to marinate.
Place the sliced french bread on the prepared baking sheet and spray with olive oil cooking spray. Bake for about 5 minutes, watching closely to ensure they don’t burn. Immediately rub the garlic on the bread slices when they come out of the oven.
Add the tomato mixture on top if serving immediately, or serve on the side.
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Notes
Storage: Store any leftovers in an airtight container. They will last a few days in the fridge. It's best to keep the bread and tomatoes separate. Do not assemble until ready to serve/eat.Substitutes: For best results, follow the recipe as is. However this is a very versatile recipe, so feel free to change the type of tomatoes and bread.