Step 1

Spray inside the slow cooker liner with nonstick cooking spray.

Step 2

Place the chicken into the slow cooker and season with salt and pepper.

Step 3

Top the chicken with bell pepper, onion, and mushrooms.

Step 4

In a bowl, combine the crushed tomatoes with the remaining ingredients: garlic, red wine vinegar, and oregano. Pour this mixture over the vegetables.

Step 5

Cover with lid and cook on low for 6 hours.

Step 6

If crispier skin is desired on the chicken, preheat the broiler and prepare a baking sheet with aluminum foil spritzed with nonstick cooking spray. When the chicken is done, transfer the chicken to the baking sheet and place under the broiler for 5 to 10 minutes or until desired crispness. Watch carefully to avoid burning.

Step 7

Serve chicken with sauce as is or over noodles, zoodles, or mashed cauliflower.