Preheat oven to 375F.

Line a rimmed sheet pan with parchment paper. Add the 1 pound of beef to the center of it and season with 1 teaspoon of salt, 1/2 teaspoon of pepper, & 1/2 teaspoon of garlic powder. Mix to combine, and then smush the meat into a rectangle slightly larger than a 12 pack of slider buns.

Bake the burger patty for 10 minutes.

While the burger is baking, make the sauce by combining 1/3 cup of mayo, 3 tablespoons of ketchup & 1 tablespoon of yellow mustard.

Cut the slider buns in half to make a top and bottom.

Pat the excess liquid and grease off of the burger patty with paper towels.

Coat the top and bottom of the slider buns with the special sauce. On the bottom half add a layer of your preferred cheese, a layer of pickles, and the giant cooked burger patty on top, then more cheese and the top half of the bun

Spray the tops of the bun with a cooking spray and sprinkle with everything but the bagel seasoning. Cover with foil and bake for 10 more minutes, or until the cheese is nice and melty.