This quick and easy 15-minute recipe shows you how to make a fast-food style roast beef and cheddar sandwich at home. Using pre-packaged ingredients like deli roast beef, au jus mix, and canned cheddar cheese sauce, it's a simple way to satisfy a craving without hitting the drive-thru.
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Place the frozen curly fries in an air fryer basket.
Air fry at 400°F until golden and crispy, following package directions for timing.
While the fries are cooking, pour the au jus mix packet into a skillet, add water, and whisk to combine.
Bring the au jus to a simmer, then add the sliced roast beef. Stir to coat and let it warm through.
In a separate small saucepan or microwave-safe bowl, warm the cheddar cheese sauce.
Butter the cut sides of the onion buns and toast them in a separate pan or on a griddle until golden brown.
To assemble the sandwiches, spread horseradish sauce on the toasted bottom bun.
Top with a generous portion of the warmed roast beef.
Spoon the warm cheddar cheese sauce over the beef.
Drizzle with Arby's sauce.
Place the top bun on the sandwich and serve immediately with the curly fries.
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