Preheat oven to 350° Fahrenheit, and line one baking sheet with parchment paper. (If you plan on frosting and serving the bars in pan, you can skip the parchment and grease the pan instead.)
In a medium sized bowl, whisk together flour, baking powder, and salt. Set aside.
Cream the butter and cream cheese together in a large sized bowl using an electric mixer until well combined. Scrape down the bowl, and repeat.
Add in granulated sugar, and continue creaming ingredients together until light and fluffy.
Mix in the eggs one at a time, and beat until incorporated. Add in extracts and mix them in as well, once again scraping the bowl to ensure even mixing.
With the mixer on a low speed, slowly add in the flour mixture, and allow dough to come together until no dry ingredient streaks are remaining. Stop the mixer, scrape down the bowl and beater, and beat for another several seconds on medium speed.
Press dough in an even layer on to the prepared baking sheet. (Optional: Use an offset spatula to smooth out the top layer further)
Bake tray on the center rack for 22-25 minutes rotating halfway through. Bake until the center of the bar feels set and no longer squishy or doughy. Make sure to rotate tray around halfway through the bake time.
Allow the cookie bar to cool completely before frosting.