Step 1: In a medium bowl, combine the chopped spinach, softened cream cheese, mozzarella, and Parmesan cheese until well blended.
Step 2: Use a sharp knife to cut a pocket into the side of each pork chop, stopping near the bone without cutting through.
Step 3: Fill each pocket with the spinach and cheese mixture, then secure the edges with toothpicks.
Step 4: Season both sides of the pork chops with salt, pepper, and garlic powder.
Step 5: Heat olive oil in an oven-safe skillet over medium-high heat. Sear the chops for 4 minutes on each side until browned.
Step 6: Place the skillet in a 375°F (190°C) oven for 10-12 minutes or until the internal temperature reaches 145°F (63°C).
Step 7: Remove from the oven and let the pork rest for 5 minutes before removing toothpicks and serving.