Preheat oven to 475 F and line 2 baking sheets with parchment paper.
Heat olive oil (2 tablespoons) in a large pan over medium-high heat until shimmering.
Add onions (1 finely diced) and cook until soft, 12 minutes.
Add minced garlic (6 cloves), dried oregano (1/2 tablespoon), and crushed pepper flakes (a pinch) and cook until garlic is fragrant, about 1 minute.
Place onions/garlic mixture in a large bowl. Add grated parmesan cheese (1 cup) and incorporate it with your hands. Add Italian sausage (1/2 Pound), eggs (2 large lightly beaten), ground beef (2 1/2 Pounds), and salt (1 1/2 teaspoon), and knead until ingredients are well incorporated.
Form mixture into 40 - 2 1/2" inch meatballs. Place meatballs on the prepared baking sheets.
Bake in preheated oven for 20 minutes.
Meanwhile, heat pasta sauce (1 - 32 Oz jar) in a large pan (use the same pan you used to cook the onions). Once meatballs are done baking, add them to the pasta sauce and continue to cook for 30 minutes.
Serve warm over your favorite low carb noodles, and enjoy!