Slow Cooker Chili

1 Reynolds slow cooker liner
1 pound lean ground beef
1 medium green bell pepper (chopped)
1 small onion (chopped)
2 cans (15 oz) red kidney beans, undrained
2 packages (1.25 oz) Chili seasoning mix (optional - Gluten Free packet)
1 can (15 oz) tomato sauce)
1 can (10 oz) diced tomatoes and green chilies
Cheese and sour cream (optional)

Brown ground beef, bell pepper, and onion over medium high heat in a skillet, drain well. Add beef mixture into slow cooker liner. Combine remaining ingredients in a large bowl then add to beef; gently stir. Place lid on slow cooker, cooking on LOW for 6-7 hours OR on HIGH for 3-3 1/2 hours until heated through. Serve directly from lined slow cooker.