Place the tomato halves in a small baking dish. Press the garlic slivers into all of the tomato halves.
Drizzle the top of the tomatoes evenly with olive oil then season with crushed red pepper flakes.
Place into the oven to roast for 20-25 minutes, or until softened and jammy. Remove from the oven and set aside to cool. Side Note: Keep the oven on.
Meanwhile, brush the baguette slices with olive oil (optional) then put them on a baking sheet.
Place into the oven to bake for 3-5 minutes, or until toasted. Flip over and continue to bake for another 2-3 minutes, or until toasted and crisp. Remove from the oven and set aside to cool.
To serve, slather each crostini with Boursin cheese then top them with one roasted tomato half. Finish with a sprinkling of fresh parsley and basil. Serve and enjoy. Side Note: If you want them extra fancy, top with a few toasted pine nuts.