Easy & Healthy Chicken Fajita Casserole

I'm always looking for easy and healthy dinners and ones that I can make paleo friendly for when I'm in the mood.  So I was really excited for this one!

• 1 green bell peppers
• 1 yellow bell pepper
• 1 orange bell pepper
• 1 red onion
• 1 can of diced tomatoes
• 1 can black beans
• taco seasoning
• 3 - 4 chicken breasts

Heat over to 350 degrees. Cut all bell peppers and onions.  Place chicken in a baking dish.  Sprinkle taco seasoning on chicken and then layer the bell peppers/onion mixture on top of the chicken.  Then spread the black beans and tomatoes over the bell peppers and onions.  Place pan in the oven and cook for an hour or until the chicken is cooked fully through.  Serve with fresh avocado and salsa.