Preheat your oven to 300°F (150°C).
Trim excess fat from the pork shoulder or pork butt. Season the pork with salt and pepper on all sides.
Heat a large skillet or Dutch oven over medium-high heat. Add a bit of oil and sear the pork on all sides until browned, about 2-3 minutes per side. This step helps to seal in the juices and adds flavor.
Once the pork is browned, remove it from the skillet and set it aside. In the same skillet, add sliced onions and minced garlic. Sauté until onions are soft and translucent, about 3-4 minutes.
Return the pork to the skillet on top of the onions and garlic. Pour the BBQ sauce over the pork, ensuring it's coated evenly. Cover the skillet or Dutch oven with a lid or aluminum foil.
Place the skillet or Dutch oven in the preheated oven and cook for 3-4 hours, or until the pork is tender and easily shreds with a fork. You can also use a slow cooker for this step if you prefer.
Once the pork is cooked, remove it from the oven and shred it using two forks. Mix the shredded pork with the BBQ sauce and onions from the skillet until well combined.
Split the slider buns and toast them lightly if desired. Spoon a generous amount of the BBQ pulled pork onto each bun. Add any optional toppings such as coleslaw, pickles, or sliced onions. Serve immediately and enjoy your delicious BBQ pulled pork sliders!