I think this is so yummy for a fix and forget it Mexican flavor dinner. It's also cheesy which I love and I can mix it all together in the morning and it's ready about time everyone is ready to eat dinner. I serve it with Cornbread.
In a skillet, brown ground beef and onion; drain fat. Add the water, taco seasoning, tomato sauce and sour cream; mix. Simmer for 20 minutes. Transfer to Crock-Pot. Stir in macaroni and chopped green pepper. Cover and cook on Low for 6 to 8 hours or on High 3 to 4 hours. In the last 30 minutes of cooking top with shredded cheddar cheese. Serve with Cornbread if desired.