01 - Preheat oven to 400°F and line a baking sheet with parchment paper.
02 - Heat 1 tablespoon olive oil in a skillet over medium heat. Add the diced onion and minced garlic; sauté for 2 minutes until softened. Add the chopped spinach and cook for an additional 2 to 3 minutes, stirring until the spinach is wilted. Transfer mixture to a plate and let cool.
03 - In a large mixing bowl, combine ground chicken, egg, grated Parmesan, almond flour, dried oregano, paprika, salt, and black pepper. Add the cooled spinach mixture to the bowl and mix thoroughly until evenly combined.
04 - With damp hands, form the mixture into 16 evenly sized small meatballs. Arrange them in a single layer on the prepared baking sheet.
05 - Drizzle or brush the meatballs with the remaining tablespoon of olive oil.
06 - Bake in preheated oven for 18 to 20 minutes, or until the meatballs are golden and fully cooked, reaching an internal temperature of 165°F.
07 - Allow meatballs to rest for 3 minutes before serving.