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Preheat the oven to 400°F. Lightly grease a 12-cup standard muffin tin.

In a medium bowl, combine the mayonnaise, ketchup, sweet pickle relish, granulated sugar, and white vinegar. Whisk until well combined and smooth. Taste and adjust seasonings if necessary. Set aside.

Take the thawed hash brown patties and press one into each cup of the prepared muffin tin, forming a cup-like shape. Use a rolling pin or the bottom of a glass to firmly press the hash browns into the cups, ensuring they hold their shape.

Bake the hash brown cups in the preheated oven for 15-20 minutes, or until golden brown and crispy. Keep an eye on them to prevent burning. Once baked, remove from the oven and set aside.

While the hash browns are baking, prepare the caramelized onions. Place the diced white onion in a cold large skillet over medium-low heat. Cook, stirring occasionally, for 15-20 minutes, or until the onions are deeply golden brown and caramelized. Patience is key for proper caramelization. Remove from heat and set aside.

In a separate large skillet, melt the butter over medium-high heat. Add the ground beef and season with salt and black pepper. Squeeze the yellow mustard in a circular pattern over the ground beef. Break up the ground beef with a spoon and cook thoroughly until browned, about 8-10 minutes. Drain any excess grease.

Spoon the cooked ground beef into each hash brown cup, filling them evenly. Top the ground beef with a small amount of the caramelized onions.

Place one square of American cheese on top of the onions in each hash brown cup. Return the muffin tin to the oven for 2-3 minutes, or until the cheese is melted and bubbly.

Carefully remove the hash brown cups from the oven. Spoon a generous amount of the prepared In-N-Out style spread on top of each cup. Serve immediately.


Preheat the oven to 400°F. Lightly grease a 12-cup standard muffin tin.

In a medium bowl, combine the mayonnaise, ketchup, sweet pickle relish, granulated sugar, and white vinegar. Whisk until well combined and smooth. Taste and adjust seasonings if necessary. Set aside.

Take the thawed hash brown patties and press one into each cup of the prepared muffin tin, forming a cup-like shape. Use a rolling pin or the bottom of a glass to firmly press the hash browns into the cups, ensuring they hold their shape.

Bake the hash brown cups in the preheated oven for 15-20 minutes, or until golden brown and crispy. Keep an eye on them to prevent burning. Once baked, remove from the oven and set aside.

While the hash browns are baking, prepare the caramelized onions. Place the diced white onion in a cold large skillet over medium-low heat. Cook, stirring occasionally, for 15-20 minutes, or until the onions are deeply golden brown and caramelized. Patience is key for proper caramelization. Remove from heat and set aside.

In a separate large skillet, melt the butter over medium-high heat. Add the ground beef and season with salt and black pepper. Squeeze the yellow mustard in a circular pattern over the ground beef. Break up the ground beef with a spoon and cook thoroughly until browned, about 8-10 minutes. Drain any excess grease.

Spoon the cooked ground beef into each hash brown cup, filling them evenly. Top the ground beef with a small amount of the caramelized onions.

Place one square of American cheese on top of the onions in each hash brown cup. Return the muffin tin to the oven for 2-3 minutes, or until the cheese is melted and bubbly.

Carefully remove the hash brown cups from the oven. Spoon a generous amount of the prepared In-N-Out style spread on top of each cup. Serve immediately.
