Quick Beef Stroganoff

1 1/2 pounds sirloin steak
2 tablespoons butter
1 large onion, diced
1 teaspoon paprika
1 teaspoon Worcestershire sauce
1/2 teaspoon salt
1/2 teaspoon garlic powder
1 (4-oz.) can sliced mushrooms, drained
1 cup sour cream

Slice meat into thin strips. Fry meat and onions until onions are tender and meat still pink. Add paprika, Worcestershire sauce, salt, garlic powder, and mushrooms. Cook and stir until mushrooms are heated and meat is lightly cooked. Add sour cream; reheat but do not boil. Serve over noodles, rice, or toast. 4-5 servings.