Preheat your grill or preheat the oven to 425 degrees.
Season the chicken with salt and pepper.
Grill it for 5-7 minutes per side or until cooked through. In the oven, place the chicken in a baking dish and cook for 25-30 minutes or until cooked through and juices run clear.
Meanwhile, mix together the jalapenos, cream cheese, green onions, and cheddar cheese.
For the grill – take the cooked chicken and place it on a piece of foil. Spread the cream cheese jalapeno mixture on top and return to grill. Close top with grill for 3-4 minutes until cheese begins to melt.
For the oven – remove the baking dish and spread the cream cheese jalapeno mixture over the chicken. Return to oven and cook 8-10 minutes or until cheese I creamy and melted.