Season the pork shoulder all over with salt, pepper, cinnamon, and nutmeg, pressing the spices into the meat to ensure they adhere.
Heat the olive oil in a large skillet over medium-high heat until shimmering, then place the pork in the pan.
Sear the pork for about 4-5 minutes per side until it develops a deep golden-brown crust and releases a rich aroma.
Transfer the seared pork to your slow cooker, then pour the apple cider over it, ensuring the liquid covers the bottom of the slow cooker.
Cover and cook on low for 6 hours, or until the pork is fall-apart tender and easily pulls apart with a fork.
Remove the pork from the slow cooker and place it on a serving platter. Meanwhile, pour the cooking liquid into a saucepan and simmer until slightly thickened and fragrant, about 10 minutes.
Shred the pork into thick chunks using two forks, then drizzle with the reduced cider sauce to coat the meat thoroughly.
Garnish with an extra sprinkle of cinnamon or fresh thyme if desired, and serve warm with your favorite sides.