Ingredients
Directions 14 steps | 60 Minutes
Measure and prep all ingredients.
![Roast Beef Sliders Recipe: Measure and prep all ingredients.](https://res.cloudinary.com/hz3gmuqw6/image/upload/c_fill,w_941,f_auto,q_10/v1668205727/recipes/DSC01760_636ecc9e41713.jpg)
Caramelize the onions. In a pan over medium-low heat, add the olive oil, unsalted butter, finely sliced onions, salt and pepper.
![Roast Beef Sliders Recipe: Caramelize the onions.](https://res.cloudinary.com/hz3gmuqw6/image/upload/c_fill,w_941,f_auto,q_10/v1668205775/recipes/DSC01763_636eccce5eb9b.jpg)
Cook for about 20 minutes, or until the onions are caramelized and brown. Remove from the heat and set aside.
![Roast Beef Sliders Recipe: Cook for about 20 minutes, or until the onions are caramelized and brown.](https://res.cloudinary.com/hz3gmuqw6/image/upload/c_fill,w_941,f_auto,q_10/v1668205792/recipes/DSC01766_636eccdf1f20f.jpg)
Prepare the poppy seed topping. In a small measuring cup, add the butter and minced garlic. Microwave in 15-second increments until the butter melts. Stir in the poppy seeds and set aside.
![Roast Beef Sliders Recipe: Prepare the poppy seed topping.](https://res.cloudinary.com/hz3gmuqw6/image/upload/c_fill,w_941,f_auto,q_10/v1668205805/recipes/DSC01772_636eccec243a3.jpg)
Assemble the roast beef sliders. Preheat the oven to 350°F. Prepare a 9x13 baking dish. Place the bottom half of the rolls into the baking dish.
![Roast Beef Sliders Recipe: Assemble the roast beef sliders.](https://res.cloudinary.com/hz3gmuqw6/image/upload/c_fill,w_941,f_auto,q_10/v1668205836/recipes/DSC01777_636ecd0b9824d.jpg)
In a bowl, whisk together the whole grain mustard, mayonnaise, Worchestershire sauce, honey, garlic powder and onion powder.
![Roast Beef Sliders Recipe: In a bowl, whisk together the whole grain mustard, mayonnaise, Worchestershire sauce, honey, garlic powder and onion powder.](https://res.cloudinary.com/hz3gmuqw6/image/upload/c_fill,w_941,f_auto,q_10/v1668205869/recipes/DSC01776_636ecd2ca3e4f.jpg)
Spread the mayonnaise mixture evenly over the rolls.
![Roast Beef Sliders Recipe: Spread the mayonnaise mixture evenly over the rolls.](https://res.cloudinary.com/hz3gmuqw6/image/upload/c_fill,w_941,f_auto,q_10/v1668205905/recipes/DSC01780_636ecd507bd90.jpg)
Top with six slices of cheese.
![Roast Beef Sliders Recipe: Top with six slices of cheese.](https://res.cloudinary.com/hz3gmuqw6/image/upload/c_fill,w_941,f_auto,q_10/v1668205917/recipes/DSC01786_636ecd5cd9fbc.jpg)
Top with the roast beef.
![Roast Beef Sliders Recipe: Top with the roast beef.](https://res.cloudinary.com/hz3gmuqw6/image/upload/c_fill,w_941,f_auto,q_10/v1668205977/recipes/DSC01787_636ecd9855aea.jpg)
Top with the caramelized onions.
![Roast Beef Sliders Recipe: Top with the caramelized onions.](https://res.cloudinary.com/hz3gmuqw6/image/upload/c_fill,w_941,f_auto,q_10/v1668205994/recipes/DSC01793_636ecdaa016ac.jpg)
Top with the remaining six slices of cheese.
![Roast Beef Sliders Recipe: Top with the remaining six slices of cheese.](https://res.cloudinary.com/hz3gmuqw6/image/upload/c_fill,w_941,f_auto,q_10/v1668206010/recipes/DSC01798_636ecdb9658eb.jpg)
Cover with the top half of the rolls. Brush the top of the rolls with the poppy seed topping.
![Roast Beef Sliders Recipe: Cover with the top half of the rolls.](https://res.cloudinary.com/hz3gmuqw6/image/upload/c_fill,w_941,f_auto,q_10/v1668206040/recipes/DSC01801_636ecdd687892.jpg)
Cover the baking dish with foil. Bake the rolls for 10 minutes. Remove the foil and bake for an additional 3-5 minutes or until the tops are golden brown.
![Roast Beef Sliders Recipe: Cover the baking dish with foil.](https://res.cloudinary.com/hz3gmuqw6/image/upload/c_fill,w_941,f_auto,q_10/v1668206111/recipes/DSC01811_636ece1e90c56.jpg)
Serve warm. Enjoy!
![Roast Beef Sliders Recipe: Serve warm.](https://res.cloudinary.com/hz3gmuqw6/image/upload/c_fill,w_941,f_auto,q_10/v1668206171/recipes/DSC01825_636ece5a42509.jpg)
Notes:
- If the Hawaiian rolls come in one piece, keep the rolls intact and slice them horizontally, creating two large halves.
- Deli-style roast beef is preferred in this recipe.
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