In a large skillet, crumble up the ground beef and add the chopped onion. Cook until meat is done and the onion is transparent. Drain off all grease. Dissolve cornstarch in cold water and pour onto meat. Stir in garlic powder, salt, pepper and soups. Cook for five minutes, stirring constantly. Reduce heat to low and simmer for another 10 minutes. Meanwhile, cook the noodles according to the package directions. Drain off water when noodles are tender. Remove the meat mixture from heat and stir in sour cream. Serve over hot noodles.
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