Heather's Sugar Cookies

I got this recipe from my friend Heather Hales who is a very talented baker.  These cookies are soft and stay puffy after they are baked.

Super Soft Sugar Cookies

Ingredients:
1/2c butter
1c sugar
2 eggs + 1 yolk
1t vanilla
1/2t baking powder
1/2t baking soda
add 1/2t salt
3/4c sour cream
3c flour (add 1/2c more, or more to get consistency right)

Instructions:

Cream butter and sugar.  Beat in eggs, sour cream, and vanilla.  Mix dry ingredients in a separate bowl, and slowly add to wet mixture.  Adding more flour as needed.  Refrigerate if your dough is too soft to roll and shape.  Roll out to 1/4″-1/2" thick and usecookie cutters.  Bake for 8min at 425f.  Cool on wire rack before frosting.

For Frosting:
1/4c butter at room temperature.
1t vanilla
1/8c heavy whipping cream (more or less to right consistency)
3c  Powdered Sugar

Beat butter and vanilla until smooth.  Add 1cup of powdered sugar at a time- be sure to beat it really well.  After 2 cups of sugar add the whipping cream.  Continue adding powdered sugar/whipping cream until the desired texture is reached.