Start by carefully slicing each chicken breast horizontally to create a pocket. Be sure not to cut all the way through. Generously season both sides with salt, pepper, and smoked paprika. This seasoning adds layers of flavor to the chicken.
In a mixing bowl, combine the chopped spinach, cream cheese, Parmesan, feta, and sun-dried tomatoes. Mix until everything is evenly blended. The creamy cheeses pair beautifully with the fresh spinach, while the sun-dried tomatoes add a touch of sweetness.
Spoon the filling into each chicken pocket, making sure to pack it in generously. Fold the top of the chicken over and secure the edges with toothpicks to keep the filling from spilling out during cooking.
Melt butter in a skillet over medium heat. Once sizzling, add the stuffed chicken breasts. Cook for 4–5 minutes on each side, or until the chicken is golden brown and the internal temperature reaches 165°F. The butter not only prevents sticking but also enhances the flavor and helps the chicken brown beautifully.