Roast Beef Sliders

Step 1
Preheat the oven to 350 degrees F (175 degrees C). Spray a 9×13-inch baking dish with cooking spray.

Step 2
Slice the rolls in half vertically, leaving each roll attached as a sheet. Peel off the top layer and set aside; place the bottoms of the rolls in the prepared dish. Layer roast beef and cheese across the rolls.

Step 3
Heat oil in a a small skillet over medium-high heat. Cook onion, bell pepper, and mushrooms until soft, about 5 minutes. Spread pepper mixture over cheese and beef. Place the tops of the rolls back on.

Step 4
Mix melted butter, garlic powder, adobo seasoning, and Italian seasoning together. Brush seasoned butter on the tops of the rolls, pouring any extra over the sides.

Step 5
Bake in the preheated oven until cheese starts to melt, about 15 minutes. Separate each roll into a sandwich using a serrated knife. Serve hot.