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Preheat oven to 350 degrees
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Add meatballs and cover with marinara sauce to a medium sauce pan over medium heat. Cover the pot and cook for several minutes until meatballs are completely thawed.
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Place hotdog buns in a baking dish
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After the meatballs are fully thawed remove them one at a time and cut them in half, place 3 halves in each bun. Continue until all buns are filled. (you may have a few left over meatballs)
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Drizzle a little extra sauce over each sub
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Topped each sub with a handful of mozzarella cheese
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Bake in oven for 10 minutes or until cheese is melted