In a medium skillet or saucepan, heat olive oil on medium heat for 15 seconds, then add garlic, oregano, and red pepper flakes and cook, stirring constantly, for 1 minute. Add crushed tomatoes and stir well; add salt and sugar and stir again until combined

Add entire package of Rosina Italian Style Meatballs to sauce, stirring so meatballs are covered in sauce. Cover pan and cook for 20-25 minutes, stirring occasionally. Move oven rack to top position, and heat the broiler to HIGH.

Spoon saucy meatballs into buns, top with cheese, and place under the broiler for 1-2 minutes, checking frequently to make sure they don’t burn.