Add beef, pork, onion, garlic, parsley, breadcrumbs, eggs and cheese to a large bowl. Sprinkle with a pinch of salt and pepper. Mix with your hands until combined.
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Next, form into 1 or 2 inch meatballs. I made 24 meatballs. Place them on a baking sheet.
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Broil meatballs on high until browned on each side. About 4-5 minutes on each side.
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Add meatballs to slow cooker. Top with crushed tomatoes, tomato paste, bay leaves, red pepper flakes and Italian seasoning.
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Cook on low for 4 hours. Season with salt and pepper to taste. Serve warm with basil or parmesan cheese for serving, if desired.
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