This Copycat Arby's Beef N' Cheddar has been my answer to late-night cravings and busy weeknight dinners for years. I first recreated it on a rainy evening when the kids wanted their usual fast-food fix, but I didn't want to get in the car. Using deli roast beef, a silky American cheese sauce, and a tangy, homemade Arby's-style sauce, the sandwich came together in less than 10 minutes and tasted shockingly like the original. The combination of tender, thinly sliced beef and the warm, slightly sweet onion bun with a bright, tangy sauce is what makes this version so memorable.

What I love most is how the textures play together: the softness of the warm onion bun, the juiciness of the beef, and the velvety cheese sauce that coats each bite. It has the fast-food nostalgia of a road-trip meal but with the comfort of home cooking and control over ingredients and sodium. Since that first night, it's become a regular on our menu when time is short and appetites are big—my family asks for curly fries on the side and we eat it like it's a special occasion even when it isn't.

Ingredients

• Onion buns: Four soft onion rolls are ideal because their mild sweet-onion flavor complements the roast beef. Look for bakery-style buns for better texture, or use regular hamburger buns in a pinch.
• Deli roast beef: One pound of thinly sliced deli roast beef from the deli counter. Ask them to slice it as thin as possible for the authentic tender, piled effect; prepackaged thin roast beef works, too.
• American cheese: Five slices of American cheese create a smooth, meltable base for the cheese sauce. If you prefer, Velveeta or shredded cheddar can be substituted, but American yields that classic fast-food texture.
• Milk: Three tablespoons of milk to loosen the cheese into a sauce. Whole milk makes the creamiest sauce; 2 percent works fine if preferred.
• Garlic powder and pepper: Quarter teaspoon garlic powder and a few grinds of black pepper to season the cheese sauce and the meat lightly.
• Arby's-style sauce: Half cup ketchup, two teaspoons water, quarter teaspoon garlic powder, quarter teaspoon onion powder, and a pinch of salt. This simple mix gives the tangy, slightly sweet profile of the chain's sauce without needing a special bottle.

Instructions

Heat the beef: Place a large skillet over medium heat. Add the thinly sliced deli roast beef in an even layer, cover with a tight-fitting lid, then reduce heat to medium-low. Let the meat steam in its own juices for 2 to 3 minutes until warmed through and tender. The lid traps steam and prevents drying; you want the beef hot but not crispy. Prepare the Arby's-style sauce: While the beef warms, whisk together 1/2 cup ketchup, 2 teaspoons water, 1/4 teaspoon garlic powder, 1/4 teaspoon onion powder, and a pinch of salt in a small bowl. Adjust seasoning to taste. Spread a thin layer on both bottom and top halves of the buns for a bright, tangy contrast to the rich cheese sauce. Make the cheese sauce: In a small saucepan over medium-low heat, combine 5 slices of American cheese, 3 tablespoons milk, 1/4 teaspoon garlic powder, and a few grinds of black pepper. Stir constantly with a silicone spatula until the cheese has melted and the sauce is smooth, about 2 to 3 minutes. If the sauce is too thick, add an extra teaspoon of milk at a time to reach your desired consistency. Toast the buns (optional): For added texture, toast the onion buns cut-side down in the hot skillet for 30 to 45 seconds until lightly golden. Remove before toasting the meat to avoid overcooking. Toasting prevents sogginess when you add the warm sauce. Assemble: Place a generous portion of the warmed roast beef on the bottom half of each bun. Spoon the warm American cheese sauce over the beef, using about 2 to 3 tablespoons per sandwich depending on taste. Add an extra spoonful of Arby's-style sauce if you like the tangy contrast. Cap with the top bun, press lightly, and serve immediately with fries.

Storage Tips

Store leftover components separately for best quality. Keep any remaining Arby's-style sauce and cheese sauce in airtight containers in the refrigerator for up to 7 days. Deli roast beef will keep for 3 to 4 days when stored tightly wrapped or in a sealed container. Avoid assembling sandwiches ahead of time if you plan to refrigerate them; the buns will become soggy. To reheat, warm the beef in a skillet over low heat and gently rewarm the cheese sauce in a small saucepan, adding a teaspoon of milk if it has thickened. Reheat assembled sandwiches in a 350 degrees F oven for 8 to 10 minutes for a crisper bun.

Ingredient Substitutions

If you prefer a different cheese profile, swap the American cheese for 6 ounces of shredded sharp cheddar combined with 2 tablespoons of cream cheese for smooth melting. Velveeta can be used for the classic melt and texture; reduce the milk if using processed cheese to avoid thinning. For a lower-sodium option, request low-sodium deli roast beef or use thinly sliced leftover pot roast. Gluten-free buns work fine, though texture will differ slightly. Catalina dressing is an easy shortcut for the Arby's-style sauce if you’re short on time—use about 1/2 cup directly on the buns.

Serving Suggestions

Serve with hot, crispy curly fries or a simple side salad to balance the richness. For a picnic or party platter, slice sandwiches into halves and secure with toothpicks, serving the sauce on the side for dipping. Garnish with pickles or thinly sliced red onions for extra acidity. During football season, pile these on a tray with small ramekins of extra sauce for guests to help themselves. A cold, crisp coleslaw makes a great counterpoint to the warm, cheesy sandwich.

Cultural Background

The Beef N' Cheddar is one of Arby’s signature sandwiches, born from American fast-food innovation that pairs convenient deli meats with meltable cheeses and bold sauces. The original became popular because it married convenience and indulgence—sliced roast beef warmed and piled high with a creamy cheese sauce on a soft onion bun. This copycat version honors that tradition by recreating the textures and flavors at home while giving cooks flexibility to control quality and salt levels.

Seasonal Adaptations

In winter, serve with a hot bowl of tomato bisque to make it a cozy combo. In summer, lighten it with a chilled cucumber salad and serve the sauce slightly chilled for a contrast. For fall, use a toasted brioche onion bun and add a smear of caramelized onions for extra depth. Holiday variations can include swapping roast beef for thinly sliced smoked turkey and adding a cranberry-mustard twist to the Arby's-style sauce for a festive touch.

Meal Prep Tips

Prepare the Arby's-style sauce and cheese sauce ahead and store in separate airtight containers. Pack chilled roast beef and buns separately, and assemble at lunchtime in the office breakroom or at home in minutes. If you’re prepping for lunches, portion sauces into small leakproof containers to spoon onto the sandwich just before eating. Use sturdy bakery-style onion buns and toast briefly at work or home to avoid sogginess.

There’s a simple joy in recreating a childhood favorite at home: it’s fast, satisfying, and gives you just enough control to make it better for your family. Make the recipe your own and enjoy the comfort of a favorite sandwich tailored to your taste.