Preheat the oven to 350 degrees and line a baking sheet with parchment paper. Set aside.
In a large bowl, using an electric mixer, cream butter and sugar together until creamy, about 3 minutes.
Beat egg, vanilla, and corn syrup into mixture until combined.
In a medium bowl, whisk flour, baking soda, and baking powder and salt together.
Add dry ingredients into the wet ingredients and mix.
Fold in the Halloween sprinkles.
Using a 1 ½ inch cookie scoop, place rounded cookie dough on the prepared baking sheet.
Add more sprinkles on top of cookie dough balls, if desired.
Bake in the preheated oven for 8-10 minutes or until the edges start to get slightly brown.
Remove from the oven and let cool on the baking sheet for 2-3 minutes before transferring to a wire rack to cool completely.