On a cutting board, use a sharp knife to cut a horizontal pocket into each chicken breast without slicing all the way through.
Lightly season the inside of each pocket with a pinch of salt and pepper.
In a mixing bowl, combine chopped spinach, cream cheese, shredded mozzarella, minced garlic, paprika, remaining salt, and black pepper until well mixed.
Evenly divide the filling and spoon into each chicken pocket.
Use toothpicks to close the openings and keep the filling inside during cooking.
Place the stuffed chicken breasts in the greased baking dish.
Lightly brush the tops of the chicken with olive oil for a golden finish.
Bake in the preheated oven for 25-30 minutes, or until the internal temperature reaches 165°F (74°C).
Remove from oven, let rest for 5 minutes, then remove toothpicks and serve warm.
Notes
Nutrition information is automatically calculated, so should only be used as an approximation.