Preheat oven to 350 degrees and line 3 baking sheets with parchment paper and set aside.
In the bowl of a stand mixer, use the paddle attachment to cream together shortening, brown sugar, and granulated sugar. Mix just until well combined.
Add in eggs, vanilla, and peanut butter. Scrape down the sides of the bowl and again mix well.
Add in flour, baking soda, and salt. Mix well, the dough will be soft.
Place reserved 1 cup of sugar into a bowl and set aside.
Using a cookie scoop, portion out cookie dough (about 1 ½ Tbsp.) and roll each into a smooth ball. Roll the cookie dough balls in granulated sugar and place on baking sheet.
Bake 12 cookies per baking sheet for 11-12 minutes each. The bottoms of the cookies will start to crack but the tops will still be smooth.
After baking, let cookies cool on the baking sheet for 2 minutes. Then. gently press one chocolate candy down on the top of each cookie. The cracks will spread around the cookie. If the edges crack too much, you can carefully shape them together again with your fingers.
Let cookies cool completely on a cooling rack to let the chocolate set up. The chocolate will get warm and melty but let it cool completely and it will be solid and you can stack and store them easily.