Preheat oven to 375°F. Line a baking sheet with parchment paper. Set aside.
In a large bowl, beat ½ cup sugar, brown sugar, peanut butter, butter, and egg until well blended. Stir in flour, baking soda, and baking powder until dough forms.
Shape dough into 1-inch balls; roll in remaining granulated sugar. Place on ungreased cookie sheets, about 2 inches apart.
Bake for 8 -10 minutes or until edges are light golden brown.
Wait for 10-15 minutes, then press 1 Reese’s in the center of each cookie and let cool on cookie sheet for 10 minutes before transferring to a wire cooling rack to cool completely.
Melt chocolate chips with a little coconut oil (1 tablespoon) by placing them in a small microwave safe bowl and microwaving for 2-3 minutes, stirring occasionally. Pour into a Ziploc bag and cut a small piece of the corner of the bag.
Using the melted chocolate, draw 4 legs onto the spider. To attach the eyeballs, pipe the chocolate onto the Reese’s and then add the eyeballs. Let cookies cool completely before serving.