Preheat your oven to 375°F (190°C) and line a baking sheet with parchment paper.
In a large bowl, combine the ground meat, finely chopped spinach, feta cheese, breadcrumbs, egg, garlic powder, oregano, salt, and pepper. Mix everything together until well combined.
Roll the mixture into small meatballs, about 1 inch in size, and place them on the prepared baking sheet.
Bake in the preheated oven for 15-20 minutes, or until the meatballs are cooked through and lightly golden on the outside.
Let the meatballs cool slightly before serving. Enjoy!