Preheat oven to 350. Line baking sheet with parchment paper In stand mixer with paddle attachment mix together peanut butter, shortening, both sugars. Mix well, until it is a bit lighter in color.
Add egg, milk and extract. Mix again until the ingredients are well incorporated and mixture looks a bit creamy.
Combine dry ingredients together in separate bowl. Whisk to combine. Slowly add dry ingredients into mixer, stirring until combined.
Roll into teaspoon size balls and roll into sugar.
Place cookie balls on baking tray and bake for 8-10 minutes or just until they crack. DO NOT over bake. While cookies are baking unwrap Hershey Kisses and have them ready in a bowl.
As soon as cookies come out of the oven, before moving them to a cooling rack, push a hershey kiss into the middle. After finishing that, move to a cooling rack. Let stand until kiss is completely cooled. If you try to package them while the kiss is cooling you will have a melted mess.