Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
     1/2                Pound ground beef
     1/2  teaspoon      Dry mustard
     1/4  teaspoon      Chili powder
   1      small         Onion -- finely chopped
     1/4                cup)
     1/2  medium        Green bell pepper -- finely
                        (about 1/4 cup)
   1      can           (16 ounces) refried beans
   1      can           (8 ounces) tomato sauce
   1      package       (1-1/4 ounces) taco -- Seasoning mix
                        Finely shredded lettuce
                        Shredded cheddar cheese
                        -----SOUR CREAM TOPPING-----
   1      cup           Sour cream
   2      tablespoons   Shredded cheddar cheese
     1/4  teaspoon      Chili powder

Preparation:

Prepare Sour Cream Topping ahead and refrigerate until ready to use. Cook ground beef in 1-inch skillet, stirring occasionally, until brown; drain. Stir in mustard, chili powder, onion, bell pepper, beans, tomato sauce and seasoning mix (dry). Heat to boiling, stirring constantly. Spread in ungreased pie plate, 9 X 1-1/4 inches.Spread Sour Cream Topping over ground beef mixture. Sprinkle with lettuce and cheese. Serve with tortilla chips or fresh vegetable slices if desired. To Microwave: Crumble ground beef into 2-quart microwavable casserole. Cover tightly and microwave on high 2 to 4 minutes, stirring after 2 minutes, until no longer pink; drain. Stir in mustard, chili powder, onion, bell pepper, beans, tomato sauce and seasoning mix (dry). Cover tightly and microwave 4 to 6 minutes, stirring after 2 minutes, until boiling. Continue as directed.SOUR CREAM TOPPINGMix all ingredients.