Before cooking, place chicken thighs in your ziplock bag with 1/2 cup of the tomato balsamic dressing. Marinate for at least 1 hour.
Place your dutch oven on a stovetop burner, set to medium heat, and also turn your oven on to 350°F.
Add your butter and garlic to your dutch oven, stir and raise heat to medium-high.
Season your chicken thighs with salt and pepper, and add to your dutch oven (with any remaining dressing from the bag) to brown, about 1 to 2 minutes on each side.
Once browned, remove your dutch oven from the hot burner. Add your tomatoes.
Use a wooden spoon or spatula to stir the tomatoes and scrape the bottom of your dutch oven. That is where the flavor lies.
Add your onions and mushrooms to the top of your chicken and tomatoes, no need to stir in.
Cover and put into your 350°F oven for 25 to 30 minutes.
That’s it! This savory meal pairs well with a salad and olives, enjoy