In a skillet brown the ground beef and onion. Drain. Add salt, garlic powder and pepper. Cut the bread lengthwise in half; butter both halves and place on baking sheets. Remove meat mixture from heat; stir in sour cream. Spoon onto bread. Sprinkle with tomatoes,green pepper and cheese. Bake 350 degrees for 20 minutes or until the cheese is melted (bake longer for crispier bread).
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