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Preheat your oven to 375F and move the rack to the middle position.
Grease a 9x13 casserole dish (I use Pam cooking spray) and add the frozen meatballs in an even layer. If using thawed cooked meatballs, skip to step 4.
Bake the meatballs 20 minutes, then take the casserole dish out of the oven.
Pour the marinara sauce over the meatballs and stir/toss until combined. Spread in an even layer, then sprinkle the cheese over top.
Return the meatballs to the oven for another 15-20 minutes or until hot and bubbly (meatballs should be 160F in the middle). Optional: broil the cheese for a few minutes to brown it.