Preparing the Pork

1. Season the pork shoulder with garlic powder, salt, and pepper.
2. Heat a large skillet over medium-high heat and sear the pork on all sides until browned.
3. Transfer the seared pork to a slow cooker, pour barbecue sauce and apple cider vinegar over it, and cook on low for 8 hours.

Shredding and Mixing the Pork

1. Remove the pork from the slow cooker and shred it using two forks.
2. Return the shredded pork to the slow cooker and mix it with any remaining barbecue sauce.

Assembling the Sliders

1. Preheat your oven to 350°F (175°C).
2. Slice the slider buns in half and place the bottom halves on a baking sheet.
3. Generously pile the shredded BBQ pork on each bun, then top with shredded cheddar cheese and crumbled bacon.
4. Place the top halves of the buns over the cheese and pork, then bake in the preheated oven for about 10 minutes, or until the cheese is melted.

Serving and Garnishing

1. Remove the sliders from the oven and garnish with sliced red onions and fresh parsley.
2. Serve warm, ideally paired with coleslaw, baked beans, or a simple salad.