01 -
Set your oven to preheat at 375°F (190°C). While waiting, lightly grease a baking dish that's large enough to hold all four chicken breasts without crowding them.
02 -
Place each chicken breast on a cutting board and, using a sharp knife, carefully slice horizontally along the side to create a deep pocket. Be careful not to cut all the way through - you want a pocket that can hold the filling while keeping it sealed on three sides.
03 -
Open each chicken pocket and layer in equal amounts of roasted red pepper strips, fresh spinach leaves, and shredded mozzarella. Press gently to close the opening and secure with toothpicks if needed to keep the filling from spilling out during cooking.
04 -
In a small bowl, combine the olive oil, garlic powder, Italian seasoning, salt, and pepper. Mix well with a fork or small whisk. Using a pastry brush, generously coat both sides of each stuffed chicken breast with this seasoning mixture.
05 -
Arrange the seasoned stuffed chicken breasts in your prepared baking dish, spacing them evenly. Bake in the preheated oven for 25-30 minutes until the chicken is fully cooked (internal temperature reaches 165°F/74°C) and the cheese has melted inside. Let rest for 5 minutes before serving to allow juices to redistribute.