In a large bowl, whisk together the flour, baking powder, cinnamon, ginger, allspice, and salt until combined.
Using a mixer, beat the butter and brown sugar together for 3 minutes or until light and fluffy.
With the mixer on low, add the molasses, vanilla, and beaten egg until fully incorporated.
Add the flour mixture in 3 additions and mix until just combined, making sure to scrape the bottom and sides of the bowl to incorporate all the ingredients into a soft dough.
Using a cookie scoop or tablespoon, scoop the dough into 2-inch balls and place them 2 inches apart on a plate or baking sheet. Cover them with plastic wrap and chill for 2 hours.
Preheat the oven to 375°F (190°C) and line two baking sheets with nonstick foil or baking paper.
Roll each dough ball in confectioners' sugar until evenly coated, then place the coated balls 2 inches apart on the prepared baking sheets.
Bake the cookies until set, approximately 10 to 12 minutes, being careful not to overbake.
Allow the cookies to cool on the sheets for 5 to 7 minutes to set, then transfer them to a wire rack to cool completely.
Notes
It's recommended to bake one batch at a time on the middle rack for the best results. If you need to bake more than one batch at a time, rotate the baking sheets from top rack to bottom rack halfway through the baking process to ensure even baking.
Ensure that you're using fresh baking powder, as expired baking powder can affect the cookies' rise and bake.
Avoid overmixing the cookie dough once the flour is added; mix until the flour is just combined, preferably at a lower speed. When in doubt, you can also mix by hand.
Chilling the cookie dough thoroughly before baking is essential for the best results. Enjoy your delicious ginger crinkle cookies!