Creating Spinach Garlic Meatballs Stuffed with Mozzarella is a straightforward process that anyone can follow. Just stick to these simple steps:

1. Preheat the Oven: Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
2. Mix Ingredients: In a large bowl, combine the ground beef, chopped spinach, minced garlic, oregano, onion powder, salt, black pepper, parsley, breadcrumbs, and egg. Mix until well incorporated.
3. Prepare Cheese: Cut the mozzarella cheese into small cubes and set aside.
4. Form Meatballs: Take a portion of the meat mixture and flatten it in your palm, creating a small patty.
5. Add Cheese: Place a cube of mozzarella in the center of the patty. Close the meat around the cheese, rolling it into a ball shape.
6. Repeat Process: Continue this process until all the meat mixture is used, placing the meatballs on the prepared baking sheet.
7. Bake Meatballs: Cook in the preheated oven for 25-30 minutes, or until the meatballs are cooked through and golden brown.
8. Check for Doneness: Ensure that the internal temperature reaches 160°F (70°C) for ground beef or 165°F (74°C) for ground turkey.
9. Rest Before Serving: Once cooked, remove the meatballs from the oven and allow them to rest for about 5-10 minutes, allowing the cheese to set slightly.

Following these steps will result in beautifully cooked Spinach Garlic Meatballs Stuffed with Mozzarella that are sure to impress!