Crockpot Chicken Cacciatore

4-6 boneless, skinless chicken breasts
1/2 lb. fresh mushrooms, sliced, or can use 1 can sliced mushrooms, drained
1 green or red pepper, chopped
1 c. chopped red onion
1/2 c. chopped celery
28 oz can diced tomatoes, I used Del Monte chili style
1 t. dried Italian seasoning
1 t. minced garlic

 Place chicken breasts in bottom of lined crockpot. Add all other ingredients. Stir to combine. Cover and cook on low for 6 hours. Serve over pasta or rice.

Enjoy!