In a baking dish, stir together tomatoes, garlic, olive oil, and salt. Bake in the oven for 20 minutes. Stir in basil, thyme, and red pepper flake. Bake another 10 minutes.
Carefully remove about a ¼ cup of liquid from the tomatoes. Whisk cornstarch into the liquid and stir it into the tomatoes. Return it to the oven for 5 minutes to thicken.
Meanwhile, cook tortellini according to package directions.
Toss tortellini with tomatoes.Serve garnished with fresh basil and Parmesan cheese, if desired
Recipe by Alison's Allspice at https://www.alisonsallspice.com/tortellini-with-cherry-tomato-basil-sauce/