Heat butter in a large pan over medium-high heat. Add chicken seasoned side down. Sprinkle remaining seasoning evenly over chicken. Cook 4 to 5 minutes per side or until juices run clear. Place chicken on serving plates and spoon 1 to 2 tablespoons sauce over each breast.
Combine strawberries, green onion, coriander and sugar in a blender or food processor. Pulse briefly to make a slightly chunky sauce. Set aside at room temperature until ready to serve.
Flatten chicken to 3/4-inch thickness, using palm of hand or a meat mallet.
Combine coriander, cumin, oregano, salt and cayenne in a small cup or bowl. Sprinkle half spice mixture over one side of chicken breasts.