Step 2
In the bowl of a stand mixer fitted with the paddle attachment, add the butter and both sugars; beat on medium-speed for 2 to 3 minutes, or until light and fluffy. Add the vanilla and beat smooth. Beat in the eggs, one at a time, beating well after each addition. Reduce mixer speed to low and gradually add in the flour mixture. Be sure not to over beat here! Turn mixer off. Using a sturdy spatula or wooden spoon, fold in chocolate chips, marshmallows, and graham crackers.