1) Heat a stove-top grill pan or griddle with cooking spray to medium-high heat. Season both sides of chicken with salt and black pepper and set aside. In a small bowl, combine lime juice, curry powder, turmeric, cumin and olive oil, as needed to loosen mixture. Mix well with a spoon and brush mixture all over both sides of chicken. Place chicken on hot pan and cook 3 to 5 minutes per side, or until cooked through. Remove from heat and place on plate.
2) While the chicken is cooking, in a small saucepan, combine coconut milk, peanut butter, lime juice, and sugar. Set pan over medium heat and bring to a simmer, about 5 minutes. Remove from heat.
3) Serve 4 of the chicken breast halves with all of the peanut sauce. Reserve remaining chicken for pastilla, if desired.