Mix ground beef, breadcrumbs, onion, garlic, milk, eggs, salt, pepper, and oregano in a bowl. Blend gently – don’t overwork the meat.
Form 1 1/2 inch meatballs, placing them on a plate.
Pour half the marinara sauce into the slow cooker.
Arrange meatballs in a single layer in the slow cooker, stacking if needed but avoid overcrowding.
Cover meatballs with remaining sauce, add red pepper flakes if desired.
Cook on low for 6-8 hours or high for 3-4 hours until meatballs are cooked through.
Stir gently to coat with sauce before serving.
Variations & Tips:
Substitute ground beef with half pork or veal for a twist.
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