In a skillet over medium heat, add a splash of olive oil and sauté one cup of fresh spinach along with 2 minced garlic cloves for about 3–4 minutes until wilted and fragrant.

In a large mixing bowl, combine 1 pound of ground beef or turkey, one beaten egg, and half a cup of breadcrumbs. Add the chopped spinach-garlic mixture, a third of a cup of grated Parmesan cheese, Italian seasoning, salt, and pepper. Mix gently until just incorporated.

Using your hands, take a small amount of the meat mixture, flatten it, place a chilled cube of mozzarella in the center, then encase the cheese completely by folding the meat around it. Roll into a ball and repeat.

Preheat your oven to 400°F (200°C). Arrange the meatballs on a lined baking sheet and bake for 20–25 minutes until golden brown and cooked through, or pan-sear for 6–8 minutes per side.

For added flavor, consider gently placing the cooked meatballs into a simmering pot of marinara sauce for 5–10 minutes.

After cooking, let the meatballs rest on a plate for about 5 minutes before serving warm.