Preheat your oven to 350°F. Lightly grease a rimmed baking sheet with butter.
Heat the olive oil in a large skillet over medium-high heat. Add the diced onion and cook for 2–3 minutes, until softened. Add the ground beef and break it apart with a spatula.
Sprinkle in the steak seasoning and garlic powder. Cook for 5–7 minutes, breaking the beef into small crumbles, until browned and cooked through.
Reduce the heat to low. Add the cream cheese and bone broth or water. Stir until the cream cheese has melted and the mixture is evenly combined and creamy. Remove from the heat.
Without separating the rolls, slice the entire package of dinner rolls horizontally to create one large top and bottom.
Place the bottom half of the rolls on the prepared baking sheet. Arrange the 4 slices of cheddar evenly over the rolls, then spread the beef mixture evenly over the cheese.
Sprinkle the shredded cheddar or mozzarella evenly over the beef.
Place the top half of the rolls over the cheese and beef mixture. Brush the tops with the melted butter, then sprinkle evenly with sesame seeds.
Bake for 12–15 minutes, or until the cheese is completely melted and the tops of the rolls are golden brown.
Let the sliders rest for 2–3 minutes, then cut between the rolls and serve warm.