Step 1

Preheat oven broiler to high.

Step 2

Place meatballs in a large saucepan and add a full jar (or 3 cups) of marinara sauce. Bring to a simmer over low heat until meatballs and sauce are heated through. (This will take a bit longer if using frozen meatballs, but they don’t need to be defrosted first.)

Step 3

Meanwhile, combine melted butter and garlic salt in a small bowl. Slice buns along the side and gently open, being careful that the bun stays intact. Place buns on a cookie sheet. Brush open face of the buns with the butter mixture. Coat well (you may not use all of the butter). Place in the oven and broil for 2-3 minutes or just until bread begins to brown. (Please note that the edges of the buns will brown further during the next steps. Remove buns from oven.

Step 4

Fill each bun with three warmed meatballs, spooning a bit of the sauce over the top.

Step 5

Top each sub with ¼-½ cup cheese. You can use all mozzarella or a combination of mozzarella and provolone. Place the cookie sheet back under the broiler for 2-3 additional minutes. Watch closely, and remove the subs from the oven as soon as the cheese is melted.

Step 6

Serve meatball subs hot, sprinkled with a bit of freshly chopped parsley, and with extra sauce on the side.