Preheat Oven And Prepare Baking Sheet: Preheat oven to 450 degrees F and arrange oven rack on middle rack. Line baking sheet with parchment paper and spray generous coating of non-stick cooking spray atop parchment paper.
Prepare Chicken Nugget Mixture: To a mixing bowl, add canned chicken, shredded mozzarella, ground sunflower seed meal, egg, garlic powder, onion powder, and pepper. Using an electric mixer, mix together until well-combined.
Prepare Breading: In a separate shallow mixing bowl, whisk together crushed pork rinds and cayenne pepper.
Prepare Chicken Nuggets: Using a spoon, scoop out ~2 Tablespoons of chicken mixture and form into nugget shape, then gently dip and coat all sides of nuggets in crushed pork rinds mixture before placing on prepared baking sheet. Repeat this process to yield 15 total nuggets placed in a single layer on baking sheet. You will have leftover crushed pork rinds; do not discard.
Bake Chicken Nuggets: Transfer baking sheet to oven and bake for 7 minutes. Remove baking sheet from oven and, using forks, flip each nugget over. Sprinkle remaining crushed pork rinds atop other side of nuggets, then return baking sheet to oven and bake for additional 6 minutes.
Serve: Remove the baking sheet of chicken nuggets from the oven. Allow nuggets time to cool slightly before serving on their own or with your favorite dipping sauce.