Preheat oven to 400˚F.
Place the cherry tomatoes, diced onion, minced garlic, salt, and red pepper flakes in an oven-safe pot, dutch oven, or baking dish.
Pour the olive oil over the tomatoes and other ingredients and give it a stir to coat everything evenly.
Place the unwrapped wheel of Boursin cheese in the center of the ingredients.
Place in the oven, uncovered, and bake for about 45 minutes or until tomatoes are soft and begin to burst and cheese melts and starts to turn golden brown on top.
Remove from oven and stir the mixture, breaking up the cheese and tomatoes.
If you have a regular blender, transfer this mixture to it and also add the chicken broth. Blend until smooth.
If you have an immersion blender, simply add the chicken broth to the mixture in the pot and blend until smooth.
Garnish with croutons and/or fresh basil if desired.