Heat oven to 375 degrees. Grease oblong pan, 13 x 9 x 2 inches. Cook and stir ground beef until light brown; drain and set aside. Mix sour cream, salad dressing, cheese, and onion; set aside. Stir baking mix and water to a soft dough; beat vigorously 20 strokes. Pat dough in pan, pressing dough 1/2 inch up sides of pan. Layer beef, tomatoes, and green pepper on dough; spoon sour cream mixture over top. If desired, sprinkle with paprika. Bake until edges of dough are light brown, 25 to 30 minutes.
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