Cook the sweet potato: Pierce the sweet potato with a fork and microwave 6–8 minutes, turning once, until very soft. Or roast at 400°F (200°C) for 40–50 minutes.
Cool slightly, peel, and mash until smooth.
Preheat and prep: Heat the oven to 400°F (200°C). Line a sheet pan with parchment paper and lightly brush or spray with olive oil.
Mix the base: In a large bowl, combine mashed sweet potato (about 3/4 to 1 cup), ground chicken, egg, 1/3 cup breadcrumbs, Parmesan (if using), garlic powder, onion powder, paprika, salt, and pepper. Stir gently until just combined.
The mixture should be soft but scoopable.
Adjust texture: If the mixture feels too wet to shape, add breadcrumbs 1 tablespoon at a time. If too dry, add a spoonful of mashed sweet potato.
Shape the nuggets: Place extra breadcrumbs in a shallow bowl. Scoop tablespoon-sized portions, roll lightly in breadcrumbs, and press into nugget shapes about 1/2 inch thick.
Arrange on the prepared pan with space between each piece.
Oil for crispness: Lightly brush or spray the tops with olive oil. This helps them brown and crisp in the oven.
Bake: Bake for 14–18 minutes, flipping halfway, until the nuggets are set and cooked through. Internal temperature should reach 165°F (74°C).
Optional broil: For extra color, broil 1–2 minutes at the end.
Watch closely to avoid over-browning.
Cool and serve: Let cool for 5 minutes so they firm up. Serve plain or with yogurt ranch, a small dab of ketchup, or mashed avocado.