Preheat your oven to 350°F. Line a baking dish or sheet pan with parchment paper or foil for easy cleanup.
Slice the slider buns in half horizontally, keeping the tops and bottoms connected as a single sheet. Place the bottom halves of the buns in the prepared baking dish.
12 slider buns
In a small bowl, mix together the mayonnaise and Dijon mustard. Spread this mixture evenly over the bottom layer of buns.
¼ cup mayonnaise, 2 Tablespoons Dijon mustard
Layer the shredded or sliced turkey over the buns.
3 cups turkey
Spoon cranberry sauce over the turkey, spreading it evenly.
1 cup leftover cranberry sauce
Lay the cheese slices over the cranberry sauce, ensuring each slider gets a good amount of cheesy goodness.
6 slices of white cheese
Place the top halves of the slider buns over the cheese layer.
In a small bowl, combine the melted butter, garlic powder, and parsley. Brush this mixture generously over the tops of the buns.
3 Tablespoons butter, 1 teaspoon garlic powder, 1 teaspoon dried parsley
Cover the sliders loosely with foil and bake for 15 minutes to melt the cheese. Remove the foil and bake for an additional 5–7 minutes, until the tops are golden and slightly crisp.
Remove from the oven and let the sliders cool for a minute or two. Use a knife to separate the sliders, and serve them warm.