Preheat your oven to 400°F. This is crucial for achieving that perfect golden-brown exterior on your meatballs.
Spray a 9×13-inch baking pan with nonstick spray. This ensures that your meatballs won’t stick and makes for easy cleanup.
In a large bowl, combine the ground chicken, breadcrumbs, diced onion, minced garlic, salt, black pepper, and egg. Mix thoroughly using your hands or a spatula until all ingredients are well combined. Look for a uniform mixture that holds together but isn’t too tightly packed.
Portion the mixture into 24 meatballs. You can use a cookie scoop for uniformity or roll them by hand. Each meatball should be about the size of a US quarter, ensuring they cook evenly.
Place the meatballs onto the prepared baking pan, making sure they are spaced evenly apart to allow for even cooking.
Bake the meatballs for 20 minutes, or until they are cooked through and reach an internal temperature of 165°F.
Once baked, remove the meatballs from the oven. Now, pour the enchilada sauce over the meatballs, making sure they are well coated.
Sprinkle the shredded Monterey Jack cheese over the top of the meatballs and return the pan to the oven for an additional 5 minutes, or until the cheese is melted and bubbly.
Finally, garnish with chopped cilantro if desired, adding a fresh touch to your delicious meatballs.