Melt some cooking fat in a large skillet placed over medium-high heat.
Cooking fat
Add the chicken and brown for 3 minutes on each side.
1 lb. chicken breast tenderloins
Remove chicken and set aside on a plate.
Add some more cooking fat to the skillet if necessary.
Add the sliced mushrooms in a single layer and brown for a few minutes per side. Remove from the pan and set aside.
12 oz. mushrooms
Add the onion and cook until soft, about 4 minutes.
1 onion
Add the garlic and sun-dried tomatoes and sauté for 2 to 3 minutes.
3 cloves garlic, ½ cup sun-dried tomatoes
Stir in the diced tomatoes, oregano, thyme, and season with salt and pepper to taste.
15 oz. fire-roasted diced tomatoes, 1 tsp. oregano, ½ tsp. thyme, Sea salt and freshly ground black pepper
Transfer the chicken back to the pan.
Cover and cook until the chicken is cooked through, about 10 to 12 minutes.
Return the mushrooms to the pan, combine well, adjust the seasoning if needed, and serve.