Make the stuffing. Mix all of the stuffing ingredients in a small bowl, until well combined.
Prep the chicken. Using a sharp knife, cut a pocket into the side of each chicken breast.
Stuff the chicken. Divide the stuffing into four (or three) equal parts and spoon it into the chicken pockets. Using toothpicks, secure the stuffing inside.
Season the chicken. Generously season the chicken with salt, pepper, and paprika. Brush with olive oil on both sides.
Bake the chicken. Bake the chicken in a preheated oven at 400ºF for 25-30 minutes, depending on how large your chicken breasts are.