Heat oven to 425 degrees. Grease square baking dish, 8 x 8 x 2 inches. Mix baking mix, sour cream, milk, pepper and soup with wire whisk or hand beater until almost smooth, about 1 minute. Spread just enough in dish to cover bottom. Sprinkle noodles, onion and beef in dish; spread remaining soup mixture over top. Bake until top begins to brown, 40 to 45 minutes. Garnish with additional sour cream if desired.
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