With stand mixer fitted with paddle attachment, cream butter at medium speed until smooth. Add the sugars and beat for apx. 1 – 1½ minutes, stopping to scrape sides of bowl as necessary. Add the peanut butter and beat until combined with ingredients. With mixer set to slow speed, add the whole egg and beat until blended, followed by the egg yolk along with the vanilla. Mix until well combined then beat in the flour mixture, about a third at a time, stopping to scrape sides of bowl, as necessary. Beat for an additional 30 seconds.
Yield: 1 – 9” square
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