01 -
Prepare the mashed potatoes according to your preferred recipe. Meanwhile, prepare Italian meatballs with marinara sauce as specified in your established method.
02 -
Set the oven to 350°F (175°C) to warm up while assembling the casserole.
03 -
Lightly coat a 9×13-inch (23×33 cm) casserole dish with cooking spray to prevent sticking.
04 -
Spread the mashed potatoes evenly across the bottom of the prepared casserole dish. Distribute the cooked meatballs with sauce evenly on top of the potatoes.
05 -
Place the casserole in the preheated oven and bake for 20 minutes to heat through.
06 -
Remove the casserole, sprinkle shredded mozzarella cheese evenly over the meatballs, then return to the oven and bake for an additional 10 minutes until the cheese is melted and golden brown.
07 -
Finish by garnishing with chopped fresh parsley and serve warm.