1 tablespoon margarine or butter
2 cups sliced fresh mushrooms
1 medium onion
2 tablespoons snipped parsley
1/2 cup rolled oats
1/3 cup milk
3/4 teaspoon salt
1/4 teaspoon freshly-ground black pepper
1 beaten egg
1 1/2 pounds lean ground beef
2 tablespoons ketchup
1 teaspoon prepared mustard
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