In a shallow dish or bowl, mix together the egg and juice of 1/2 lemon. In another shallow dish or bowl mix together the flour, garlic powder and paprika. Dip chicken breasts in egg mixture, then flour mixture.
Heat butter or margarine in a large skillet over medium heat. Add chicken breasts and cook until golden on each side.
In a medium bowl, mix together broth and juice of 1 lemon, and pour mixture over chicken in skillet. Reduce heat to medium low and let simmer for about 8 minutes. Place on serving platter, and garnish with fresh lemon slices and parsley sprigs.
