Prepare the chicken:

Place the chicken breasts in the slow cooker. Pour the BBQ sauce over the chicken and sprinkle with garlic powder, onion powder, salt, and pepper. Mix to coat the chicken evenly.

Cook the chicken:

Cover and cook on low for 6-7 hours or on high for 3-4 hours, until the chicken is cooked through and tender. Shred the chicken using two forks and mix it with the sauce in the slow cooker.

Assemble the sliders:

Preheat the oven to 350°F (175°C). Slice the slider buns in half and place the bottom halves on a baking sheet. Spoon the shredded BBQ chicken onto each bun and top with shredded cheddar cheese. Add the top halves of the buns.

Brush with butter:

Melt some butter and brush it over the tops of the slider buns for added flavor.

Bake:

Bake in the preheated oven for about 10-15 minutes, until the cheese is melted and the buns are lightly toasted.

Serve:

Remove from the oven, sprinkle with sliced green onions if desired, and serve warm. Enjoy your delicious sliders!