Mix the Meatball Ingredients:
In a large bowl, combine ground beef, breadcrumbs, Parmesan, eggs, garlic, salt, pepper, Italian seasoning, milk, and parsley.
Mix with your hands (gently!) until everything is just combined. Overmixing can make the meatballs dense.
Shape the Meatballs:
Use your hands or a cookie scoop to form 1½-inch balls. This size keeps them juicy but manageable. You should get around 20–24 meatballs.
Brown the Meatballs (Optional):
If you like a deeper flavor, brown the meatballs in a skillet with a bit of olive oil for 2–3 minutes per side before adding them to the slow cooker.
Make the Sauce:
In your slow cooker, mix crushed tomatoes, tomato sauce, tomato paste, basil, oregano, sugar, and olive oil. Stir to combine.
Add the Meatballs:
Gently place meatballs into the sauce, spooning a little sauce over the top so they’re fully coated.
Slow Cook:
Cover and cook on:
Low for 6–8 hours, or
High for 3–4 hours
You’ll know they’re done when the sauce is bubbling and the meatballs are tender and fully cooked (165°F internal temperature).
Serve & Enjoy:
Stir gently, garnish with fresh parsley or grated Parmesan, and serve over pasta, rice, or mashed potatoes.