Place the boneless ham at the bottom of your slow cooker, ensuring it's snug and fits well.

In a mixing bowl, combine the apple juice or cider, Dijon mustard, whole grain mustard, honey, brown sugar, apple cider vinegar, garlic powder, onion powder, and black pepper. Whisk until smooth.

Pour the mustard sauce evenly over the ham, ensuring it's thoroughly coated.

Cover the slow cooker with its lid and set it to cook on low for 6 to 7 hours.

Once the ham is cooked, carefully remove it from the slow cooker and place it on a cutting board to cool slightly.

Transfer the cooking liquid from the slow cooker into a saucepan and simmer over medium heat. Stir in the heavy cream.

Return the shredded ham to the slow cooker and pour the creamy sauce over it. Gently stir to combine and warm through.

Garnish with fresh parsley before serving.