Preheat oven to 350F degrees. Line a 9×13 or similar baking dish with foil and spray the bottom with cooking spray.
Mix together the mayonnaise and ketchup and set aside.
Pull rolls apart or slice your sheet of Hawaiian rolls in half lengthwise.
Spread the mayo mixture onto the bottom of the rolls.
Place two quartered provolone cheese slices onto each bottom roll.
Next, divide the pastrami deli meat evenly between the sliders.
Place two quartered Swiss cheese slices onto each slider, followed by two dill pickle slices on each slider.
Place the top bun layer back onto the sliders.
Mix together the melted butter, poppy seeds and garlic powder. Generously brush across the tops of the slider buns.
Cover the baking dish with foil and bake in the oven for 15-20 minutes, or until the sliders are cooked through and the cheese is melted.
Optional* place the cooked sliders under the broiler for 2-3 minutes to brown the top of the rolls.
Serve immediately, enjoy!
