Beat butter, both sugars, peanut butter, egg and vanilla until fluffy in a large bowl. Add salt and baking soda and mix well. Slowly add flour and beat until fully incorporated.
With a small cookie scoop, scoop out ball of dough and roll ball in the sugar. Note: If you don’t have a cookie scoop, shape dough into 1-inch portions.
Place balls into an ungreased mini muffin pan. Do not flatten.
Bake or 10-12 minutes until puffed and lightly golden brown. As soon as you pull out cookies from oven, press 1 Reese’s Cup into the center of each cookie. Cool completely in muffin pan before removing.
Recipe by Sweet Dash of Sass at https://sweetdashofsass.com/2013/12/reeses-peanut-butter-cup-cookies/