Cook ground beef and taco seasoning mix according to package
directions. In bottom of a medium casserole, spread refried beans;
sprinkle with onions. PLace meat over beans. Bake at 400 F for 15
minutes. Tuck nacho chips around edge of casserole. Top with green
pepper and grated cheddar cheese. Bake 5 minutes. Garnish with sour
cream, chopped green onion and chopped tomato.