Step 1: Preheat and Prepare
Preheat your oven to 350°F (175°C). Lightly spray a 9×13-inch baking dish with cooking spray or grease it lightly with butter to prevent sticking.

Step 2: Cook the Ground Beef
Heat a large skillet over medium-high heat. Add the ground beef and break it up with a wooden spoon or spatula. Cook for 6-8 minutes, stirring occasionally and breaking the meat into small crumbles, until the beef is browned and cooked through with no pink remaining. Drain excess grease from the pan (leave about 1 tablespoon for flavor).

Step 3: Season the Beef
Return the drained beef to the skillet (off heat). Add Worcestershire sauce, garlic powder, onion powder, salt, and black pepper. Stir well to combine, ensuring all the meat is evenly seasoned. Taste and adjust seasonings if needed—this is your chance to make it perfect!

Step 4: Prepare the Buns
Without separating the individual rolls, use a sharp serrated knife to slice the entire block of connected slider buns in half horizontally, creating a complete “sheet” of bottom buns and a complete “sheet” of top buns. This keeps everything connected for easy assembly. Place the bottom half of the buns in your prepared baking dish.

Step 5: Assemble the Sliders
Spread the seasoned ground beef evenly over the bottom buns in the baking dish, creating an even layer that covers all 12 bun bottoms. Top the beef with cheese slices, arranging them to cover the entire surface (you may need to overlap slightly or tear slices to fit). If using pickles, layer them on top of the cheese now.

Step 6: Add the Top Buns
Place the connected sheet of top buns over the cheese and pickles, creating a complete sandwich “slab.” Everything should fit together perfectly since the buns are still connected.

Step 7: Make the Butter Topping
In a small bowl, combine melted butter with garlic powder. Stir well. Using a pastry brush, generously brush the butter mixture over the tops of the buns, making sure to cover the entire surface. Sprinkle with sesame seeds and everything bagel seasoning if using.

Step 8: Cover and Bake
Cover the baking dish tightly with aluminum foil. Bake in the preheated oven for 15 minutes. This covered baking time allows the cheese to melt completely and the sliders to heat through.

Step 9: Uncover and Finish
Remove the foil and bake for an additional 5-8 minutes, uncovered, until the tops of the buns are golden brown and slightly crispy. The butter should be absorbed and the buns should look toasted.

Step 10: Cool and Serve
Remove from the oven and let cool for 2-3 minutes. Using the serration lines on the buns as your guide, cut between each slider to separate them. Serve immediately with your favorite burger toppings and condiments on the side, letting everyone customize their sliders.