Heat oven to 350 degrees. Cook and stir ground beef and onion in 10 inch skillet until beef is light brown; drain. Stir in 2 Tablespoons baking mix, the catsup, mustard, salt, pepper and sour cream. Simmer uncovered 5 to 10 minutes. Beat 2 cups baking mix, the egg and milk with hand beater until smooth. Pour about 1/2 cup batter onto hot griddle. (grease griddle if necessary). Each pancake should be about 7 1/2 inches in diameter. Bake until pancakes are dry around edges. Turn and bake other sides until golden brown. Cool slightly. Spoon scant 1/2 cup beef mixture onto each pancake. Roll up; place seam sides down in ungreased oblong baking dish, 13 1/2 x 8 3/4 x 1 3/4 inches. Sprinkle with cheese. Bake until heated through, about 10 minutes.
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