Preheat your oven to 350°F (175°C).
In a bowl, whisk together melted butter and garlic powder until combined.
In a second bowl, mix 3 cups of prepared pork with 2/3 cup of barbecue sauce. You may opt to add a little more, but keep in mind you don't want soggy sliders.
Cut the slider buns in half, horizontally, keeping the bottom buns attached and the top buns attached (if possible).
Place the bottom half of the buns in a baking dish. Brush the bottoms with a bit of butter sauce.
Layer each bun evenly with the coated pulled pork. Spread the six slices of cheese across the pork so that it is evenly spaced out.
Evenly distribute the drained pineapple tidbits over the pork so that all sliders have some.
Place the other half of the buns on top, creating sandwich sliders.
Brush the remaining butter sauce over the tops of the sliders.
Optionally, sprinkle parsley over the sliders for added texture and flavor.
Cover the baking dish with aluminum foil and bake in the preheated oven for about 15-20 minutes, or until the sliders are heated through and the cheese is melted.
Optional: remove foil and place sliders back in the oven for 2-5 minutes to brown the tops of the sliders a bit.
Remove from the oven and let them rest for a few minutes before serving. You may need to gently run a knife through the sandwiches - at the natural divisions of the rolls - to ensure the sliders will pull apart easily.