Smothered Cube Steak

Ingredients

• 1 large onion, peeled, halved and thinly sliced salt and pepper
• 1 lb  ground beef beef
• 1 tablespoon butter
• 1 tablespoon vegetable oil
• 4-8 slices American cheese Mayo, mustard and pickles, for serving
• 4  hamburger buns, toasted

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