Preheat your oven to 350°F (175°C).
In a sauce pan, mix the apricot barbecue sauce ingredients: barbecue sauce, apricot preserves, brown sugar, and garlic powder. Heat over medium heat until bubbly. Allow to cool somewhat.
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.
Layer each bun with evenly with chopped brisket followed by 3/4 of the apricot barbecue sauce, and the cheese. Spread the eight slices of cheese across the brisket so that it is evenly distributed.
Place the other half of the buns on top, creating sandwich sliders.
In a microwave safe bowl, melt butter.
Brush the butter sauce over the tops of the sliders.
Sprinkle parsley and Everything Bagel seasoning (optional) over the sliders for added texture and flavor.
Cover the baking dish with aluminum foil and bake in the preheated oven for about 15 minutes, or until the sliders are heated through and the cheese is melted.
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.