Here is a really simple stroganoff recipe. So this isn't really american, technically it's russian, but I didn't know where to fit it in!
4 tablespoons butter
1/2 onion, chopped
2 garlic cloves, chopped
1 teaspoon paprika, 1/4 teaspoon red pepper flakes, salt and pepper
1 tablespoon flour
2 tablespoons lemon juice
1/2 cup cream
Saute onion in butter for a few minutes. Add the mushrooms and saute for about ten minutes, until the juices are almost gone. Add the spices and garlic for 30 seconds. Add the flour and mix. Then the lemon juice and cream. Bring to a simmer and take off heat. Serve over rice!