Preheat Oven: Set oven to 350˚F (175˚C). Butter the bottom of a rimmed baking sheet to prevent sticking.
Cook Ground Beef Mixture: Heat a large skillet over medium-high heat with olive oil. Add the diced onion and cook for 2-3 minutes, or until softened. Add the ground beef to the skillet. Break it up with a spatula and season with salt, black pepper, and garlic powder. Cook until the beef is just browned and cooked through, then remove from heat. Tilt the skillet to remove excess fat using a spoon. Stir in 1/4 cup mayonnaise to make the filling creamy and flavorful.
Prepare the Slider Base: Place the bottom halves of the dinner rolls on the prepared baking sheet. Line the rolls with sliced cheese, ensuring the cheese fully covers the bread.
Assemble Sliders: Spread the ground beef mixture evenly over the cheese layer, using the back of a spatula to press it into a compact, even layer. Place the shredded cheddar cheese on top of the ground beef. Place the top halves of the buns over the filling, cut-side down.
Add Butter and Sesame Seeds: Brush the tops of the buns with melted butter. Sprinkle sesame seeds over the buttered tops for added texture and flavor.
Bake: Bake in the preheated oven for 12-15 minutes, or until the cheese is melted and the tops of the buns are golden brown.
Serve: Slice sliders apart and serve warm. Perfect for game days, or quick dinners!
Enjoy these cheesy, savory sliders! 🎉🍔