Cook ground beef until done. Mix with taco seasoning as directed. Set aside. Slice and dice jalapenos, green/red peppers, and onions. Set aside. Prepare Kraft Mac and Cheese according to directions. Set aside.
In a medium sized mixing bowl, mix sour cream and Mexican or cheddar cheese until creamy. Mix cooked ground beef with prepared Kraft Mac and Cheese. Add sour cream and cheese mixture. Stir in peppers, tomatoes and onions.
Bake in a 350 degree oven for about 20 minutes or until hot. Serve.