Preheat your oven to 350°F (175°C).
Slice the slider buns in half horizontally and place the bottom halves on a baking sheet.
In a small bowl, mix together the mayonnaise and Dijon mustard. Spread this mixture evenly over the bottom halves of the slider buns
Layer the roast beef evenly over the mayonnaise mixture, followed by the cheddar cheese slices.
Place the top halves of the slider buns over the cheese.
In another small bowl, mix the melted butter with garlic powder and dried parsley. Brush this mixture over the tops of the slider buns.
Cover the sliders with aluminum foil and bake in the preheated oven for 15 minutes.
Remove the foil and bake for an additional 5 minutes, or until the tops are golden brown and the cheese is melted.
Remove from the oven, let cool slightly, and serve warm.
Variations & Tips
For a spicier kick, add some sliced jalapeños or a dash of hot sauce to the mayonnaise mixture. If you have picky eaters, you can substitute the cheddar with a milder cheese like mozzarella or Swiss. For a touch of sweetness, try adding a thin layer of caramelized onions or a dollop of cranberry sauce. You can also use whole wheat or pretzel slider buns for a different texture and flavor.
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