
In bowl of stand mixer fitted with paddle attachment, cream the butter and shortening at medium-high speed until smooth and creamy, about 1 minute. With mixer set at low speed, gradually add the granulated and brown sugars then beat on medium-high speed for 2 minutes, stopping periodically to scrape down sides of bowl as necessary. Mix in the whole egg and beat for a few seconds to incorporate, stopping if necessary to scrape down sides of bowl. Repeat with the egg yolk and, lastly, add the vanilla. Do not overbeat mixture.
Using either a cookie scoop or two tablespoons, scoop up dough (about 1 1/8 oz per cookie) and transfer to prepared baking sheet, spacing cookies 2” apart. Bake for 11-13 minutes (depending on cookie size and oven), or until cookies have puffed up, have the appearance of the tops starting to look dry, edges set, and the cookies are slightly tanned. Rotate cookie sheets at the halfway point during baking. For soft-textured cookies, do not overbake. Remove cookies from oven and cool completely on cookie sheet (i.e., about 30 minutes). Cookies freeze well.
Yield: Apx. 30-32 cookies (depending on amount of dough used per cookie and size of cookie desired)
[Copyright My Island Bistro Kitchen]