Slow Cooker Chicken Cacciatore

Ingredients

• 3 lb boneless skinless chicken thighs
• 1 large white onion, thinly sliced
• 2 celery stalks with leaves, chopped
• 6 oz can tomato paste
• 14 oz canned diced fire roasted tomatoes
• 1 lb mushrooms, sliced
• 1 green pepper, chopped
• 1 red bell pepper, chopped
• 6 garlic cloves, minced
• 2 tsp oregano
• 1 1/2 tsp dried basil
• 2 tsp salt
• 1/2 cup red wine (dry or white wine or chicken broth)
• 1/8 tsp red pepper flakes