Preheat & Prepare the Pan: Set your oven to 400°F and line a rimmed baking sheet with parchment paper.
Mix the Chicken Patty: In a large mixing bowl, combine the ground chicken, egg, ½ cup of Parmesan, panko, basil, garlic powder, ¼ teaspoon of salt, and a few grinds of black pepper. Stir well until evenly incorporated.
Shape & Bake the Patty: Transfer the mixture to the prepared baking sheet and flatten it into a large rectangle, slightly bigger than the 12-pack of rolls. Bake for about 15 minutes, or until the patty is fully cooked and firm to the touch. Expect some liquid to release during baking—this is normal.
Prepare the Rolls: While the patty is baking, carefully slice the Hawaiian rolls in half horizontally, keeping them connected as one large sheet. Try to keep the top and bottom as even as possible.
Assemble the Sliders: Remove the baked chicken patty from the oven, blot any excess grease with paper towels, and leave the oven on. Sprinkle ½ cup of shredded mozzarella onto the bottom half of the rolls. Place the patty over the mozzarella layer, then spread the marinara sauce evenly on top. Sprinkle the remaining ½ cup of mozzarella over the sauce and place the top half of the rolls over everything.
Bake Again: Using the parchment paper, carefully transfer the assembled sliders back onto the baking sheet. Lightly coat the tops of the rolls with nonstick cooking spray and sprinkle the remaining 2 tablespoons of Parmesan over them. Cover with foil and bake for 10 minutes, then uncover and bake for another 2 minutes until the cheese is fully melted and the rolls turn golden brown.
Serve & Enjoy: Let the sliders cool for a couple of minutes before slicing them apart. Serve immediately with extra marinara sauce on the side for dipping.