In a small bowl, whisk together the flour, salt and baking soda.
3.
In the bowl of an electric mixer, add butter, sugar, brown sugar and peanut butter. Cream together until fluffy. This will take a few minutes.
4.
Add in egg, vanilla extract and milk. Mix until combined.
5.
Slowly incorporate flour mixture until dough comes together.
6.
Shape into 40 equal-sized balls and place each ball in the cup of a mini-muffin tin.
7.
Bake for about 8 minutes. The cookie will have filled the cup and started to puff up.
8.
Remove from the oven and immediately push a frozen miniature peanut butter cup into the middle of the warm cookie. Let cookie cool in the pan and then carefully remove the cookie.
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