Instructions
step 1 In a small bowl mix mayonnaise, ketchup, and mustard to create the burger sauce.
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step 2 Heat a flat-top griddle or heavy skillet over high heat and add vegetable oil.
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step 3 Place the beef balls onto the hot surface and smash them down firmly with a spatula to create thin patties.
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step 4 Season the patties with salt, black pepper, and garlic powder.
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step 5 Cook for about 2 minutes until the edges become dark, crispy, and caramelized.
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step 6 Flip the patties and immediately add cheddar cheese slices on top so they melt.
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step 7 In the same pan cook the sliced onions in butter until soft and lightly caramelized.
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step 8 Toast the brioche bun lightly on the griddle until golden.
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step 9 Spread the burger sauce on the bottom bun.
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step 10 Stack the cheesy smash patties with caramelized onions layered between them.
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step 11 Finish with the top bun and gently press down before serving.
Storage and Reheating Tips
Store leftover burger patties in an airtight container in the refrigerator for up to 3 days. Reheat them in a hot skillet for 1–2 minutes per side to restore their crispy edges. Toast buns fresh before serving and assemble the burger just before eating for the best texture and flavor.
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