In a large mixing bowl, stir together the beef, egg, breadcrumbs, parmesan cheese, garlic powder, Italian seasoning, salt, pepper and fresh parsley. Mix with your hands or a wooden spoon until just combined (do not over mix).
Take approximately 2 tablespoons of the meat mixture. Roll it into a ball and place a piece of the cheese into the center of the ball.
Continue this process until all the meatballs are formed.
Add all the sauce ingredients to a crock pot. Gently stir to combine all the ingredients and add the meatballs to the crock pot.
Cover and cook on high for 2-3 hours or on low for 4-6 hours.
Then the meatballs are ready to serve and enjoy!
Notes
Refrigerate the leftovers in an airtight container for up to 5 days.