Slow Cooker

1. In a large bowl, mix together MEATBALLS ingredients. Taking 2-4 tbsp of meat*, form into a ball and then flatten the ball in the middle.
2. Add mozzarella to the center of the flattened meat. Re-form meat around the mozzarella and shape into a ball. Repeat until all the meat is used.
3. Pour SAUCE ingredients into the slow cooker. Add the meatballs.
4. Cook HIGH 2-3 hours or LOW 4-6.

Instant Pot

1. In a large bowl, mix together MEATBALLS ingredients. Taking 2-4 tbsp of meat*, form into a ball and then flatten the ball in the middle.
2. Add mozzarella to the center of the flattened meat. Re-form meat around the mozzarella and shape into a ball. Repeat until all the meat is used.
3. Set Instant Pot to the high saute setting. Once hot, add oil.
4. Add meatballs and brown on each side, 3-5 minutes. Remove meatballs from pressure cooker. You might have to brown them in batches.
5. Add sauce ingredients and stir to mix well. If needed, deglaze the bottom of the pressure cooker by scraping all the bits off with a wooden spoon. Add the meatballs back into the pressure cooker.
6. Close and seal vent. Select manual setting and set time for high pressure,  7 minutes. Quick-release pressure when cook time is completed.