Combine the melted butter and garlic powder. Remove the tops of the slider buns. Place the bottom half in an oven safe casserole or pan. Brush the bottom half of the buns with the garlic butter.
Broil on low for 60-90 seconds until lightly toasted. Set aside.
In a medium bowl, combine ground chicken, Parmesan cheese and Italian seasoning. Use your hands to gently combine.
Divide the portion into 9 equally sized slider patties. Preheat oven to 375°F.
Heat a large skillet over medium heat. Add olive oil, then add the chicken patties and cook, turning once, for 5-6 minutes per side. Patties are cooked through when they reach a temperature of 165°F when measured with a meat thermometer.
Remove from the heat. Top each patty with a generous spoon of marinara sauce. (The remainder will be served as a dipping sauce).
Add mozzarella cheese and replace the tops of the buns.
Bake for 6-8 minutes, until cheese begins to melt. If the tops look like they're turning too brown, you can loosely tent the pan with aluminum foil.
When the cheese is melted, remove from the oven and serve.