Copycat Subway Meatball Marinara Sandwich

golf sized meatballs of choice, pre-cooked (I used both my vegan version and my paleo version linked above)

Mezzetta marinara sauce, divided (can use any unsweetened marinara sauce)

garlic powder

onion powder

mixed herbs

Red pepper flakes,

Sea salt to taste (I used 1/2 tsp)

x sub sandwich rolls of choice (if strictly paleo, omit)

Parmesan cheese for topping (I used a vegan cashew parmesan cheese linked above)

Sandwich fillings of choice (optional)