Line a rimmed baking sheet with parchment paper, or spray lightly with non-stick cooking spray, or line with a silicone baking mat.
Soak oats in milk in a small bowl until softened, about 2 minutes. Squeeze oats to remove any excess liquid; discard milk.
Lightly beat egg in a large mixing bowl, then add turkey, onions, oats, and seasonings. Use gloved hands or a mixing spatula to incorporate all ingredients together. Use a large cookie scoop (3 Tablespoon size) or gloved hands to form 18 meatballs. Space evenly on prepared baking sheet.
Stir together tomato paste and olive oil and brush over meatballs. Place pan into oven and bake until meatballs are just cooked through and a food thermometer inserted into the center reads 163 degrees F., about 15 to 20 minutes.
Serving suggestion: Serve meatballs over rice or pasta with your favorite sauce, or alone, along with a garden salad.
This recipe for Healthy Baked Turkey Meatballs without Breadcrumbs was created by ItsYummi.com. https://www.itsyummi.com/baked-turkey-meatballs-with-grilled-onions/ is copyrighted and may not be used without prior consent in writing from the owner.