Prepare the Chicken Breasts : Preheat your oven to 375°F (190°C). Using a sharp knife, carefully cut a pocket into each chicken breast, being careful not to slice all the way through. Season both sides of the chicken with salt, black pepper, and garlic powder.

Stuff the Chicken : Lay a slice of prosciutto inside each chicken breast pocket. Fill with an even layer of chopped spinach and top with shredded mozzarella cheese. Gently press the chicken to close the pocket, using toothpicks to secure if necessary.

Season the Chicken : In a small bowl, mix the paprika with the grated Parmesan cheese. Sprinkle this mixture evenly over the top of each stuffed chicken breast for added flavor and a crisp, golden crust.

Sear the Chicken : In an oven-safe skillet, heat the olive oil over medium-high heat. When the skillet is hot, add the stuffed chicken breasts and sear them for 2 to 3 minutes on each side, or until they develop a golden brown crust.

Bake in the Oven : Transfer the skillet to the preheated oven and bake for 15-20 minutes, or until the chicken is cooked through and reaches an internal temperature of 165°F (74°C).

Serve : Remove the toothpicks and allow the chicken to rest for a few minutes before slicing.