Preheat the oven to 350 degrees. Line a cookie sheet with parchment paper or a silicone baking mat.
In a medium bowl add your flour, baking soda and salt. Mix and set aside.
Then using a stand mixer or hand mixer add your butter, shortening, brown sugar, and granulated sugar. Cream for 2-3 minutes on medium speed.
Add in the egg, vanilla, and peanut butter. Mix and make sure to scrape down the sides.
Slowly work in the dry ingredients.
Use a 1-inch cookie scoop and make cookie dough balls on baking sheet, leaving 2 inches apart.
Bake for 7 minutes, then remove from teh oven. Place the peanut butter cup at the top of the cookie. Then bake another 5 minutes.
Melt chocolate while the cookies are finishing baking.
Once cookies are done place on a cooling rack. Then place the candy eyes on the melted Reese's cup.
Then put chocolate in a piping bag and draw an oval shape for the body. Then make 4 legs on each side of cookie for legs.