Defrost the spinach according to package directions. Squeeze all of the water out of the spinach and place it in a large bowl. Add the ground chicken, onion powder, garlic powder, oregano, salt, pepper, egg, feta cheese, and breadcrumbs. Mix to combine. Form the mixture into approximately 16 meatballs, about 1-½ inches in diameter.
Place the meatballs on the baking sheet sprayed or brushed with olive oil. Mix the olive oil and paprika together in a small bowl. Brush the mixture onto the tops of the meatballs.
Bake meatballs on the upper shelf in the oven, 15-16 minutes until lightly browned and cooked through to an internal temperature of 165°F. Serve meatballs with desired accompaniments like rice, pasta, pita bread, vegetables, or tzatziki.