01 - Preheat oven to 350°F. Line baking sheets with parchment paper and set aside.
02 - In a large mixing bowl, beat softened butter and granulated sugar together using an electric mixer until light and fluffy, approximately 2-3 minutes.
03 - Add egg and vanilla extract to the butter mixture. Beat until fully incorporated and smooth.
04 - In a separate bowl, whisk together all-purpose flour, salt, and baking powder until evenly distributed.
05 - Gradually add dry ingredients to the wet mixture, mixing on low speed just until flour disappears. Do not overmix.
06 - Scoop approximately tablespoon-sized portions of dough and roll into smooth balls. Roll each ball generously in pastel sprinkles or colored sanding sugar to coat completely.
07 - Place coated dough balls 2 inches apart on prepared baking sheets to allow for spreading.
08 - Bake for 8-10 minutes until edges are set but centers remain slightly soft. Remove from oven when done.
09 - Immediately press one chocolate blossom kiss into the center of each hot cookie. The chocolate will soften slightly, helping it adhere.
10 - Allow cookies to rest on baking sheets for 5 minutes to set. Transfer to wire rack and cool completely before storing.