Slice the roast beef thinly if not pre-sliced, and set aside.
1/2 pound roast beef
Slice the slider buns in half horizontally and arrange the bottom halves on a baking sheet.
12 small slider buns
Layer slices of roast beef evenly over the bottom buns, then top each with a slice of provolone cheese.
1/2 pound roast beef, 4 slices provolone cheese
Place the top buns over the assembled sliders and brush them lightly with melted butter.
1 tablespoon butter
Bake the sliders in a preheated oven at 375°F (190°C) for about 8-10 minutes, until the cheese is melted and bubbly, and the buns are lightly toasted.
Remove from oven, let cool slightly, then serve hot with the tops of the buns in place.