Preheat your oven to 375°F (190°C).
Prepare the stuffing by combining the diced pears, Gorgonzola, chopped walnuts, and thyme in a bowl. Season with salt and pepper.
Use a sharp knife to create a pocket in each chicken breast by slicing horizontally but not all the way through.
Stuff each chicken breast with the pear and Gorgonzola mixture, filling them generously without overstuffing.
Heat olive oil in a large oven-safe skillet over medium-high heat. Sear the stuffed chicken breasts for about 4-5 minutes on each side until golden brown.
Once browned, transfer the skillet to the preheated oven and bake for 20-25 minutes, or until the internal temperature reaches 165°F (75°C).
Remove from the oven and let the chicken rest for 5 minutes before slicing.
Serve the stuffed chicken alongside your choice of vegetables or a light salad for a balanced meal.