In a large saucepan over low heat, combine the garlic and olive oil.
Keep a close eye because garlic toasts very quickly. Cook and stir for 1-2 minutes, until it's light golden brown.
Add the onions, and cook for 5-6 minutes, or until the onions are soft, translucent, and brown. (The onions add moisture, so they keep the garlic from continuing to toast).
Set aside to cool.
Meanwhile, in a large bowl, combine ground turkey, turkey sausage, egg whites, Parmesan cheese, oats, pesto, and wine.
Add onions, and combine.
Roll the mixture into 2-inch balls and place the meatballs on a large baking sheet lined with aluminum foil.
Bake at 375 degrees for 25-28 minutes, flipping the meatballs after 20 minutes.
Remove from heat.
In a large stock pot, combine the marinara sauce and wine.
Add the meatballs, stirring gently to coat.
Bring to a simmer, and cook for at least 10-15 minutes. You can turn the stove on low, and leave them for several hours if you want them to continue to meld and absorb flavor.
To assemble sliders, place a meatball on the bottom half of the bun, top with a slice of mozzarella cheese, a sprinkle of Parmesan cheese, and the top half of the bun. Serve and enjoy!