Homemade Cheesy Meatballs in a Rich Creamy Onion Sauce

Step 1: Make the Meatballs: In a mixing bowl, combine the ground beef, breadcrumbs, egg, shredded mozzarella cheese, salt, and pepper. Mix until well combined. Shape the mixture into meatballs of your desired size, ensuring they are evenly sized for even cooking.
Step 2: Cook the Meatballs: In a large skillet, heat 2 tablespoons of olive oil over medium heat and brown the meatballs on all sides until cooked through. Remove from the skillet and set aside.
Step 3: Make the Creamy Onion Sauce: In the same skillet, melt the butter and add the sliced onions. Sauté until the onions are soft and caramelized. Sprinkle the flour over the onions and stir to combine, cooking for a few minutes to create a roux.
Step 4: Thicken the Sauce: Gradually whisk in the milk until the sauce thickens. Stir in the grated Parmesan cheese until melted and the sauce is smooth.
Step 5: Combine & Simmer: Return the meatballs to the skillet and simmer in the sauce for a few minutes to allow the flavors to meld together.
Step 6: Serve: Serve the meatballs hot, garnished with additional cheese and fresh herbs if desired.

Protein Options: Substitute ground beef with ground turkey or chicken.
Gluten-Free: Use gluten-free breadcrumbs for a gluten-free version.
Vegan Option: Substitute the mozzarella and Parmesan with a vegan cheese alternative, and the milk with a non-dairy milk.