Mix together Butter Chicken Curry Paste, mayonnaise and sour cream in a small bowl. Spread over the uncooked chicken breasts. Let marinate in the fridge for 3 to 4 hours.
Grill both sides over medium-high heat until the temperature on a meat thermometer reaches 165°F. Set aside to cool.
Once cooled, roughly chop into bite-sized pieces and set aside.
Pasta Salad
Cook pasta according to the package directions and set aside.
In a large bowl, combine chicken, green onions, tomatoes, green pepper and pasta.
In a small bowl, stir together mayonnaise, sour cream, Butter Chicken Curry Paste and salt. Pour into pasta salad mixture and stir to coat.