Preheat your oven to 400°F. Line a baking sheet with aluminum foil for easier cleanup, and spray it with cooking spray to prevent sticking.
In a large, shallow bowl, combine the Panko breadcrumbs, Parmesan cheese, Salt, and Pepper. Mix them together well to create a flavorful coating.
Melt the Unsalted butter in a medium microwave-safe bowl, about 30 seconds on high power. Be careful not to overheat.
Take each piece of chicken and first dip it in the melted butter, allowing it to coat the meat fully.
Next, dip the buttered chicken into the breadcrumb mixture, ensuring it's well-covered. Pat the crumbs onto the meat gently for better adherence.
Place your coated nuggets onto the prepared baking sheet, leaving space between each piece for even cooking.
Sprinkle any remaining breadcrumb mixture over the top of the nuggets for an extra crunchy layer.
Bake the nuggets for about 30 to 33 minutes, or until cooked through and lightly golden brown.
While the nuggets are baking, make your honey mustard dipping sauce by mixing Honey, Yellow mustard, and Dijon mustard in a bowl.
Once the nuggets are done baking, serve them warm with your dipping sauce.