In a large bowl, cream butter and sugar with electric mixer. Beat in egg and vanilla.
In a separate bowl, combine baking powder, cocoa powder, ground cinnamon, chili powder and flour.
Add flour mixture to butter mixture, one cup at a time, mixing until just combined after each addition. The dough will be crumbly at first but then come together and be stiff.
Do NOT chill dough. Divide dough into two balls and flatten slightly. On a floured surface (I use a big cutting board), roll each ball to about ¼” thick. Using cookie cutters, cut out desired shapes. Repeat with remaining dough.
On ungreased cookie sheet, bake on middle rack of oven 6-8 minutes or until cookies are lightly browned.
Remove from oven and keep on baking sheet for 2 minutes. Using a spatula, remove cookies to cooling rack and cool completely.
To Make the Icing
In small bowl, whisk together powdered sugar and corn syrup. Slowly add water whisking until combined.
To Decorate Cookies
In a decorator icing bag (you can buy these at any craft store or some discount stores like Walmart or Target), add about half of the icing. You don't need a metal tip-just snip off a tiny bit of the tip. Pipe icing on to cookie in the shape of skeleton bones. Set cookies on baking rack to dry. Repeat with extra icing and cookies.
When icing is dry (after about 2 hours), store in airtight container for up to a week or in freezer for up to three months.
This recipe calls for unsweetened baking cocoa. You can find this ingredient on the baking aisle of your grocery store. Make sure you’re buying the baking cocoa and not cocoa mix (like for hot chocolate). I get that question often so wanted to mention it!Make Ahead Prep TipsMake the dough and icing up to a day in advance and store in refrigerator. Allow it to come to room temperature before rolling out and baking. Or make a cookie "kit" of the dry ingredients and then follow recipe accordingly to prepare with other ingredients. Freezer Friendly!These cookies are freezer friendly. Freeze in an airtight container for up to 3 months.