Leave the slider buns attached, and slice them in half lengthwise. Place the bottom half of the buns in a 9x13-inch baking dish.
12 slider buns
Layer the provolone cheese over the buns, then add the sliced onions and roast beef. Place the top half of the buns over the filling.
8 ounces sliced provolone cheese, 1 pound deli-sliced roast beef, ½ cup thinly sliced white onion
In a small saucepan over low heat, melt the butter. Stir in the Worcestershire sauce, Dijon mustard, garlic powder, onion powder, and seasoned salt.
½ cup unsalted butter, 1 tablespoon Worcestershire sauce, 1 teaspoon Dijon mustard, ½ teaspoon garlic powder, ¼ teaspoon onion powder, ¼ teaspoon seasoned salt
Pour the butter mixture evenly over the tops of the sliders.
Cover the baking dish loosely with foil and bake for 10 to 15 minutes, until the cheese is melted and the sliders are heated through. Remove the foil and bake for another 5 minutes, or until the tops are golden brown.
Use a sharp, serrated knife to separate the sliders. Serve hot with au jus for dipping.
Notes
Butter topping: The butter topping is meant to be poured over the sliders and baked. It isn’t used as a dipping sauce.
Au jus for dipping: The au jus in the photos is store-bought. A packet, jarred au jus, or homemade au jus all work.
Make a foil tent: If the tops start browning too quickly before the cheese melts, cover the sliders loosely with foil and move the pan to a lower oven rack.
How to make ahead: To make these ahead, assemble the sliders through the meat and cheese layer, cover, and refrigerate. Wait to add the butter topping until right before baking so the buns don’t get soggy. If baking straight from the fridge, add 5 to 7 extra minutes as needed.
Storage: Store leftover sliders in an airtight container in the refrigerator. Reheat them in a 300°F to 350°F oven, covered with foil, for 10 to 15 minutes or until warmed through. An air fryer also works at 350°F for 4 to 5 minutes. I’d skip the microwave since it can make the buns soft and the roast beef rubbery.
Nutrition Facts
French Dip Sliders
Serving Size
1 slider
Amount per Serving
Calories
272
% Daily Value*
Fat
15
g
23
%
Saturated Fat
9
g
45
%
Trans Fat
0.3
g
Polyunsaturated Fat
1
g
Monounsaturated Fat
4
g
Cholesterol
55
mg
18
%
Sodium
839
mg
35
%
Potassium
158
mg
5
%
Carbohydrates
18
g
6
%
Fiber
1
g
4
%
Sugar
3
g
3
%
Protein
16
g
32
%
Vitamin A
404
IU
8
%
Vitamin C
18
mg
22
%
Calcium
279
mg
28
%
Iron
2
mg
11
%
* Percent Daily Values are based on a 2000 calorie diet.