Baked Mozzarella Stuffed Meatballs with Bubbly Marinara Sauce Step-by-step instructions

Before you start

Before beginning the cooking process, organize all ingredients and equipment to ensure a smooth workflow. Measure out the ground beef, sweet Italian sausage, breadcrumbs, grated parmesan, and spices. Beat the egg in a small dish and chop the fresh parsley.

Cut the low-moisture mozzarella into even half-inch cubes and have the marinara sauce ready. Preheat the oven to 400°F (204°C) and place your baking dish on the counter so everything is within easy reach.

Instructions

Prep and Shape

1. 1Mix the meatball mixture
   In a large mixing bowl, combine the ground beef, sweet Italian sausage, Italian seasoned breadcrumbs, beaten egg, grated parmesan cheese, garlic powder, onion powder, kosher salt, and black pepper. Gently mix the ingredients with your hands just until combined, being careful not to overwork the meat, which can make the meatballs tough.
   Look for Mix until the ingredients are evenly distributed but still light and textured.
   Tip Dampen your hands with cold water before mixing to keep the meat from sticking to your fingers.
2. 2Shape and stuff the meatballs
   Divide the meat mixture into 12 equal portions, about 2 tablespoons each. Flatten one portion in the palm of your hand, place a cube of mozzarella cheese in the center, and wrap the meat completely around the cheese. Roll it gently between your palms to form a smooth, tight ball with no cracks.
   Look for Ensure the cheese is fully sealed inside with no visible seams or holes.
   Tip A tight seal prevents the cheese from leaking out during the baking process.

At the end of this phase, the seasoned meat mixture is fully combined and divided into twelve uniform portions. Each portion is carefully wrapped around a cube of mozzarella cheese and rolled into a smooth, seamless ball. There should be no visible cracks, seams, or exposed cheese, ensuring the delicious filling remains safely trapped inside during baking. The raw meatballs should feel firm and hold their shape perfectly on the prep board.

Assemble and Bake

3. 3Assemble in baking dish
   Pour the marinara sauce into the bottom of a 9x13-inch baking dish, spreading it into an even layer. Arrange the stuffed meatballs in the sauce, spacing them evenly. Place the baking dish in an oven preheated to 400°F (204°C) and bake for 20 minutes.
   Look for The sauce should be bubbling gently around the edges of the dish.
   Tip Using a high-quality marinara sauce ensures a rich flavor base for the meatballs.
4. 4Add cheese and finish baking
   Carefully remove the baking dish from the oven. Sprinkle the shredded mozzarella cheese evenly over the top of the meatballs. Return the dish to the oven and bake for an additional 5 minutes, or until the cheese is melted, bubbly, and lightly golden brown, and the meatballs reach a safe internal temperature of 160°F (71°C).
   Look for The cheese should be melted, golden, and stretching beautifully when pulled.
   Safe temperature 160°F (71°C) internal temperature (ground meat)
   Tip Switch the oven to broil for the last 1 to 2 minutes for a deeper golden crust.

At this point, the meatballs have baked in the bubbling marinara sauce, absorbing its rich flavors while browning beautifully on top. The shredded mozzarella cheese added in the final minutes is completely melted, bubbly, and boasts a gorgeous, light golden brown color.

The savory aroma of garlic, herbs, and melted cheese fills the kitchen, and the internal temperature of the meatballs has reached a safe 160°F (71°C) when checked with a digital meat thermometer.

Garnish and Rest

5. 5Garnish and rest
   Remove the baking dish from the oven and place it on a heatproof surface. Let the meatballs rest for 5 minutes to allow the juices to redistribute and the melted cheese inside to set slightly. Sprinkle the freshly chopped flat-leaf parsley over the top before serving hot.
   Look for The resting period helps the cheese pull remain intact rather than immediately running out.
   Tip Keep leftovers in the refrigerator within 2 hours of baking.

After resting for five minutes, the bubbling marinara sauce has settled slightly and the melted cheese inside the meatballs has firmed up just enough to maintain its structure without running out instantly. The fresh parsley scattered over the top adds a vibrant green contrast to the rich red sauce and golden cheese. When pulled apart, the center reveals a dramatic, steaming, and incredibly stretchy cheese pull that is ready to enjoy.

Common mistakes

One common mistake is failing to seal the meatball completely around the cheese cube. If any gaps or thin spots remain, the melting cheese will find its way out during baking, leaving you with hollow meatballs and a messy baking dish.

Another error is overworking the meat mixture, which yields a dense, tough texture. Finally, do not skip the resting period; cutting into the meatballs immediately will cause the molten cheese to rush out, rather than staying thick and stretchy.

How to tell it’s done

To ensure the meatballs are safe and delicious, use a digital meat thermometer inserted into the meaty portion of a meatball, avoiding the cheese core. The internal temperature must reach 160°F (71°C) to guarantee the ground beef and sausage are fully cooked.

Visually, the meatballs should feel firm to the touch, the marinara sauce should be thick and bubbling, and the top layer of mozzarella cheese must be completely melted and golden brown.

• Ground meat: 160°F (71°C) in the thickest part
• Egg dishes: 160°F (71°C) in the thickest part