Preheat your oven to 400°F (200°C). Line your baking sheet with parchment paper or a silicone mat for easy cleanup.
Divide your frozen meatballs into four equal portions. Place each portion into a separate mixing bowl. Add 1 cup of BBQ sauce to the first bowl, 1 cup of pesto to the second, 1 cup of marinara sauce to the third, and 1 cup of buffalo sauce to the fourth. Toss each batch gently until the meatballs are well coated in their respective sauces.
Arrange the meatballs on the prepared baking sheet in four distinct sections, keeping the different sauce-coated meatballs separated.
Bake the meatballs in the preheated oven for 25-30 minutes, or until they are heated through and the sauces are bubbling and slightly caramelized around the edges.
Once out of the oven, sprinkle shredded parmesan cheese over the marinara and pesto meatballs if desired, and serve with ranch dressing on the side for dipping those buffalo meatballs.
