Preheat oven to 350F degrees
Slice baguette to about 1/2" to 1" thick slices
Spread one side of the baguette slices with butter (you can also brush lightly with olive oil if prefered). Set aside
Slice enough brie cheese for each of the baguette slices
Place each of the baguette slices buttered-side down on a parchment-lined baking sheet
Bake in oven for 5-8mins until the cheese starts to melt and the bottom of the baguette slices start to brown
While the baguette slices are in the oven, dice the garlic very finely and place in a bowl
Cut the cherry tomatoes into quarters and add to the garlic
Then add the balsamic vinegar, basil, salt and, olive oil. Mix together
Bring the baguette slices out of the oven once they are slightly browned and the cheese has started to melt