Pat the pork chops dry with paper towels, then season both sides with salt and black pepper. Let the seasoned pork chops rest for about 15 minutes.

Heat olive oil in a large skillet over medium-high heat until shimmering. Sear the pork chops for 3 to 4 minutes on each side until deep golden brown and cooked to 145°F. Transfer to a plate and cover loosely with foil.

Reduce heat to medium; sauté sliced onion and apple in the same skillet for 5 to 7 minutes until tender and translucent.

Stir in apple butter and whole grain mustard. Add a splash of water (about ¼ cup) to loosen the mixture. Cook for 2 to 3 minutes to combine the flavors.

Return the pork chops to the skillet, nestling them into the sauce. Let simmer for about 5 minutes, allowing the flavors to absorb.