Preheat oven to 350°F. Line a 9x13” pan with foil or parchment paper, and spray lightly with cooking spray.
If your buns/rolls aren't sliced, follow the next step. If they're pre-sliced, omit the next step.
Add a package of buns/rolls to your cutting board and using a serrated knife (like a bread knife), carefully slice across them horizontally, keeping one hand on top of the rolls to steady them.
To a large mixing bowl, add all filling ingredients except the chicken (bacon, cheese, ranch, mayo, garlic powder, onion powder, dill, salt, and pepper). Stir well to combine.
Add chicken and toss until well coated.
Keep the buns/rolls connected to each other (on the top and bottom halves). Add the bottom section of the rolls to the prepared baking pan, cut side up.
Spread the chicken filling evenly over the tops of the cut rolls.
Add the top sections of the rolls, cut side down.
In a small bowl, combine the melted butter with garlic powder.
Brush or pour topping over the sliders.
Cover with foil and bake in preheated oven for 15 minutes, then uncover and bake another 10 minutes, until as golden brown and crispy as you’d like.
Remove from the oven and let sliders sit for about 5 minutes to cool slightly. Cut into individual sliders, sprinkle with parsley and serve hot.
