Preheat oven to 450°F.
Add the ground beef, ground pork, bread crumbs, Parmesan cheese, eggs, garlic cloves, parsley, salt, and pepper to a medium-sized bowl. Use your hands to combine until well mixed.
Use a melon baller (or a rounded ½ tablespoon measuring spoon) to scoop balls of the meat mixture and place on a sheet pan lined with parchment paper or aluminum foil. Lightly roll between the palms of your hands into small balls and reset on the sheet pan.
Bake for 7-10 minutes or until lightly browned and just cooked through. Set aside.
For the Mac and Cheese
Cook the pasta about 1-2 minutes less than suggested so pasta is al denté. Drain the water and set the noodles aside.
In a deep bottom saucepan, melt the butter over medium heat. Add the flour and whisk briskly for about 2 minutes to cook the flour. Pour in the milk, whisking continuously to prevent any lumps. Keep whisking until the sauce thickens enough to coat the back of a spoon, about 2-3 minutes. Stir in cheese until smooth and add salt and pepper to taste.
In a large bowl, combine the cooked pasta with the cheese sauce. Add the mini meatballs and stir well to combine everything. Top with parsley and serve.