When I make spaghetti and meatballs, I always make sure to make extra meatballs. Mostly because my kids like meatball subs. I find it makes for a very quick meal the next day. With 4 ingredients you are good to go! Thankfully for quick dishes like this, there are great brands out there like Udi's that make gluten-free hamburger buns. What a time saver! Here is how I make my meatball sandwiches.