Over medium heat, heat up a large skillet with the olive oil. Season both sides of pork chops with salt and pepper.
Add pork chops, sear 4-5 minutes on both sides. Cooking time will be dependant on the size of your pork chop. Internal temperature should be 145 degrees. Set aside.
Without cleaning out the pan, add red onion. If the pan is dry, additional olive oil may be needed. Cook until onions starts to soften, approximately 3-4 minutes. Add garlic, cooking for another 1 minute.
Add balsamic vinegar and pineapple chunks, brining to a low simmer until liquid has reduced and sauce starts to become sticky - approximately 10 minutes.
Add pork chops back to the pan, spooning sauce over top. Cook for 2-3 minutes, just enough to reheat. Serve immediately.