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Place frozen meatballs in a slow cooker.
Pour both jars of marinara over the top of the frozen meatballs.
Cover and cook on high for 4 hours.
Preheat your oven to 350 F.
Open your hoagie rolls so the inside will get toasted.
Place your rolls on a baking sheet and toast for about 5 mins.
Add 2 slices of Mozzarella cheese to each hoagie roll and return the rolls to the oven.
Continue to toast for 5 minutes or until cheese is melted.
Add about 4 to 5 meatballs to each hoagie roll.
Garnish with grated Parmesan, chopped parsley and a sprinkle of red pepper flakes.
Serve with a side of additional sauce from the slow cooker.