Season pork chops on both sides with salt and pepper.
Heat olive oil in a large skillet over medium-high heat. Sear pork chops for 3 to 4 minutes on each side until golden brown. Remove from pan and set aside.
Add sliced onion to the pan and sauté until soft. Stir in garlic and cook for another 30 seconds.
Pour in chicken broth, mustard, and soy sauce. Scrape up any browned bits from the bottom of the pan.
Whisk in cornstarch slurry and let the sauce simmer until slightly thickened.
Return pork chops to the pan, spoon sauce over the top, and let simmer for 2 to 3 minutes until heated through.
Serve warm, garnished with fresh parsley.