01 - 
                Heat your oven to 375°F (190°C). Grab a baking dish and either grease it lightly or line with parchment for an easier cleanup later.
              
              
              
                02 - 
                Melt 1 tablespoon butter in a skillet over medium heat. Toss in those chopped mushrooms and let them dance around for about 5 minutes until they start to soften. Add the garlic, thyme, parsley, and a pinch of salt and pepper. Cook another 2 minutes until your kitchen smells amazing. Set aside to cool a bit.
              
              
              
                03 - 
                In a bowl, combine your slightly cooled mushroom mixture with the cream cheese and mozzarella. Mix until everything's smooth and happy together.
              
              
              
                04 - 
                Carefully slice each chicken breast horizontally (but not all the way through!) to create a pocket for all that cheesy goodness. Take your time with this step - sharp knives and slippery chicken can be tricky!
              
              
              
                05 - 
                Spoon that delicious cheesy mushroom mixture evenly into each chicken pocket. If they're not staying closed, secure with toothpicks to keep all that goodness inside.
              
              
              
                06 - 
                Melt the remaining 2 tablespoons of butter in your skillet over medium-high heat. Add the stuffed chicken and sear for 2-3 minutes per side until beautifully golden brown. Don't worry about cooking them through yet.
              
              
              
                07 - 
                Transfer your seared chicken to the baking dish. Sprinkle with Parmesan cheese and bake for 20-25 minutes until the chicken reaches 165°F (74°C) internally.
              
              
              
                08 - 
                Let the chicken rest for 5 minutes before serving (this keeps it juicy!). Sprinkle with fresh parsley for a pop of color, then serve with your favorite sides.