Prep your pan: Heat the oven to 400°F (205°C).
Line a baking sheet with parchment and lightly brush or spray with olive oil to prevent sticking.
Grate the onion: Use the small holes of a box grater over a bowl. The onion pulp and juices help keep the meatballs moist—add it all.
Mix the base: In a large bowl, combine ground turkey, grated onion, garlic, breadcrumbs, egg, parsley, oregano, paprika, salt, pepper, and Parmesan if using.
Gently combine: Use a fork or your hands to mix just until everything comes together. Do not overmix or the meatballs can turn dense.
Shape the meatballs: Lightly oil your hands and roll into 1.5-inch balls (about 16 meatballs). Place on the prepared baking sheet, spacing evenly.
Bake: Cook for 14–18 minutes until the centers reach 165°F (74°C).
For a touch of browning, broil on high for 1–2 minutes at the end.
Serve your way: Toss in warm marinara, squeeze over lemon and sprinkle herbs, or plate with roasted veggies and grains.
Alternative methods: To pan-sear, heat a large nonstick skillet with 1 tbsp olive oil over medium. Cook in batches, turning until browned and cooked through, 8–10 minutes. To simmer, brown briefly, then add to a pot of marinara and gently cook 10 minutes.