01 - Set oven temperature to 400°F (200°C) and allow to preheat.
02 - Heat 1 tablespoon olive oil in a skillet over medium heat. Sauté minced garlic and fresh spinach until wilted, about 2 to 3 minutes. Remove from heat and set aside.
03 - With a sharp knife, cut a deep pocket on the side of each chicken breast, ensuring not to slice all the way through.
04 - Generously season the inside and outside of each chicken breast with salt, black pepper, Italian seasoning, and paprika.
05 - Fill each pocket with sautéed spinach, roasted red peppers, and shredded mozzarella cheese.
06 - Close the stuffed chicken breasts and secure the openings with toothpicks or kitchen twine.
07 - Heat the remaining tablespoon of olive oil in an oven-safe skillet over medium-high heat. Sear chicken breasts for 3 to 4 minutes per side until golden brown.
08 - Transfer skillet to preheated oven. Bake for 15 to 20 minutes, or until chicken reaches an internal temperature of 165°F (74°C).
09 - Remove toothpicks or twine. Plate and serve hot.