Remove jalapeno seeds to reduce heat if you prefer a milder slider. Use sharp cheddar for a richer flavor, or mix cheddar with Monterey Jack for a creamier melt. For extra crispiness, broil the sliders for 1-2 minutes at the end of baking but watch closely to avoid burning. Let the chicken cool before mixing with cheese to prevent the cheese from melting prematurely. Brush the buns with garlic butter instead of plain butter for an extra flavor boost. Make ahead: Prepare the chicken mixture in advance and assemble the sliders just before baking.