Step 1

Arrange a rack in the middle of the oven and heat the oven to 350°F.

Step 2

Without separating the rolls, cut 1 package Hawaiian sweet dinner rolls in half horizontally with a serrated knife. Place the bottom half of the rolls in an 11x7- or 9x13-inch baking dish.

Step 3

Place 1/4 cup mayonnaise and 2 tablespoons of the Dijon mustard in a small microwave-safe bowl and stir to combine. Spread the mixture onto the cut sides of both the bottom and top halves of the rolls.

Step 4

Wipe out the bowl. Add 2 tablespoons unsalted butter to the bowl and microwave until melted, about 20 seconds. Add 1/2 teaspoon kosher salt and the remaining 1 tablespoon Dijon mustard, and stir to combine.

Step 5

Arrange 4 ounces Havarti or Swiss cheese on the bottom half of the rolls in an even layer. Top with 12 ounces sliced turkey, folding the slices into quarters before placing them onto the rolls. Top with the remaining 4 ounces cheese. Close with the top half of the rolls, mayonnaise-side down. Brush the tops of the rolls with the melted butter mixture, using it all. Cover the baking dish tightly with aluminum foil.

Step 6

Bake until the cheese is melted, 15 to 20 minutes. Uncover and bake until the rolls are lightly browned and toasted, 6 to 8 minutes more. Cut the serrated knife to separate the sliders into individual sandwiches before serving.