In a medium bowl, combine the flour, cacao powder, baking powder, and salt. Set aside.
Using a hand mixer or stand mixer, beat the butter, sugar, vanilla extract, and egg together on medium-high speed until smooth.
Slowly, blend in the dry ingredients to the wet until they are just combined. Be careful not to over mix!
Cover the bowl of dough with plastic wrap and let it chill in the refrigerator for about 30 minutes.
Preheat oven to 350°F. On a floured surface, roll the dough out with a rolling pin until it's about 1/4-inch thick. Using a maple leaf shaped cookie cutter, cut out the cookie shapes and place them onto a baking sheet lined with parchment paper.
Bake the cookies for 10 to 12 minutes, or until the edges turn a light shade of golden brown. Remove the cookies from the oven and allow them to cool for a couple minutes. Enjoy!