Combine butter and sugar and mix until creamy.

Add flavor & eggs and beat until fluffy

Add flour on a low speed, slowly

Put dough in refrigerator for a couple hours.

For thick large cookies bake at 375 for 10-14 mins (or until just set, do not wait for them to start browning)

For thin cookies, bake at 350 for 8-13 minutes.

As for the frosting.... I use the basic royal frosting recipe. Here is one from Food Network.

http://www.foodnetwork.com/recipes/alton-brown/royal-icing-recipe/index.html