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Adjust oven rack to upper-middle position and preheat oven to 475 degrees.
Heat olive oil in a large skillet, over medium-high heat, until shimmering. Cook onions until golden and very soft, 10-15 minutes.
Add garlic, Italian seasoning, and pepper flakes and cook until fragrant, about 1 minute. Set aside and cool.
In a large mixing bowl, add milk and bread and allow to sit for 10 minutes. Mash.
Add cooled onion mixture, ground beef, sausage, Parmesan, eggs, salt and pepper and knead until ingredients are well combined.
Form mixture into 2 1/2 inch meatballs (you should have approximately 16 meatballs), place on rimmed baking sheet and bake for about 20 minutes, or until well browned.
Transfer meatballs to pot of sauce and simmer for 15-20 minutes. Serve over cooked pasta and garnish with fresh chopped basil or parsley!