In a small bowl, combine softened butter, garlic powder, onion powder, and salt. Split the hoagie buns in half lengthwise, leaving them attached at the bottom. Apply the garlic butter to the inside of the buns.
Place the buns on a baking sheet or in a pan, and broil them for 2 to 3 minutes until they begin to toast and the butter begins to melt.
Remove the buns from the oven and divide the meatballs between each of the buns with several spoons of marinara sauce. Top with shredded cheese, and return to the broiler.
1 cup mozzarella cheese
Bake at 300°F for an additional 2 to 3 minutes until the cheese is melted.
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Notes
*The calories listed are an approximation based on the ingredients in the recipe card and a serving size of 1 sandwich. Actual calories will vary.*For more information, tips, and answers to frequently asked questions, please refer to the post.