01 -
Heat the oven to 350°F (175°C). Line two baking sheets with parchment paper and unwrap the mini chocolate peanut butter cups.
02 -
Beat the butter, peanut butter, granulated sugar, and brown sugar until creamy. Beat in the egg and vanilla, then stir in the flour, baking soda, and salt just until combined.
03 -
Scoop the dough into 24 balls, about 1 tablespoon each. Roll each ball in the extra sugar and place 2 inches apart on the prepared baking sheets.
04 -
Bake for 8-10 minutes, until the edges are lightly golden and the centers still look soft. Let the cookies sit on the pan for 1 minute.
05 -
Press one mini chocolate peanut butter cup into the center of each warm cookie. Transfer the cookies to a wire rack and cool completely before piping the legs.
06 -
Melt the chocolate chips or wafers until smooth. Spoon into a piping bag or small zip-top bag, snip a tiny corner, and pipe 4 legs on each side of every candy cup. Use small dots of chocolate to attach 2 candy eyes to each spider.
07 -
Chill the cookies for 10-15 minutes, or until the chocolate legs are firm. Store in a single layer or with parchment between layers.