Season the pork chops on both sides with salt and black pepper to taste.
Set a straight-sided 12" skillet over medium-high heat on the stovetop, then add the cooking oil and sear each side of the pork chops until golden brown.
Remove the pork chops and set aside. Add the mushrooms and continue cooking until the mushrooms have released their juices and are tender. Then set aside with the pork chops.
Reduce the heat to medium-low, then melt butter in the skillet. Once butter has melted whisk in flour to form a roux. Continue to whisk for 2 minutes to cook out the raw flour taste.
Slowly add the chicken broth in batches, while continuing to whisk, ensuring it is fully blended into the flour mixture before adding more. Repeat until all of the broth has been added.
Add Worchestershire sauce and fresh thyme to the gravy, along with a pinch of salt.
Place the seared pork chops and mushrooms in the skillet with the gravy, then bake in the oven for 25 minutes. Remove from the oven and serve immediately.
Notes
The pork should reach a minimum temperature of at least 145 degrees when tested with an instant-read thermometer.