Stir flour, cocoa, baking powder and salt in a medium bowl. Set aside. Beat butter with sugar in a large bowl, using an electric mixer on medium-high, until fluffy, 2 to 3 min. Beat in egg and vanilla. Reduce speed to low and gradually beat in flour mixture until combined.
Divide dough in half and wrap in plastic. Chill until firm, about 1 hr.
Position rack in centre of oven, then preheat to 350F. Line 2 large baking sheets with parchment.
Scoop heaping 1 tbsp portions of chilled dough and roll into 1-in. balls. Arrange 2 in. apart on prepared sheets.
Bake until tops begin to crack, 10 to 11 min. Remove cookies from oven, then gently press 1 chocolate kiss in centre of each cookie. Transfer cookies to a rack to cool until firm, about 3 hr or overnight. Cookies will keep well, stored in an airtight container at room temperature, for up to 3 days.
Nutrition (per cookie)
Originally published in the Today’s Parent November/December 2019 issue. Photo byCarmen Cheung.