Preheat oven to 375 degrees. Line a baking sheet with nonstick foil.
In a medium bowl, mix together the flour, cocoa powder, baking powder, baking soda and salt. Set aside.
In a large mixing bowl or the bowl of a stand mixer, beat the cottage cheese for about a minute. Add the butter and both sugars and beat for another 2 minutes. Reduce mixer speed to low and add egg and vanilla, beating just until mixed.
With a mixing spoon (or using the lowest speed of a stander mixer fixed with a paddle), gradually add the flour mixture to the butter mixture and stir until incorporated. Stir in the chocolate chips.
Using a tablespoon measure, scoop up dough and arrange balls of dough (they'll be sticky -- not perfectly round) on the baking sheet about 2 inches apart. Bake on center rack for 10 minutes or until cookies appear set. Transfer to a wire rack to cool. After about 5 minutes or when the cookies are warm rather than very hot, sift some powdered sugar over them. This covers up the little flecks of cottage cheese.
Notes
Yield is approximate, but you should get between 24 and 30 cookies.