Step 1

Whisk together the flour, baking soda and salt in a medium bowl until combined.

Step 2

Add the butter, granulated sugar and brown sugar to the bowl of a stand mixer fitted with the paddle attachment. Beat on medium-high speed until pale and fluffy, about 5 minutes. Add the peanut butter and continue beating until fluffy, 1 minute. Add the egg and vanilla and beat until combined. With the mixer on low speed, gradually add the dry ingredients until combined. Cover with plastic wrap and refrigerate for 1 hour.

Step 3

Position 2 racks in the upper and lower thirds of the oven and preheat to 350 degrees F. Lightly grease 2 baking sheets with nonstick spray.

Step 4

Roll half the dough into 1-inch balls (about 1 tablespoon each) and then roll in granulated sugar. Place on the prepared baking sheets about 2 inches apart. Chill the remaining dough while the first batch bakes.

Step 5

Bake, rotating and switching the pans halfway through, until the cookies are puffed and lightly golden, 10 to 11 minutes. Immediately press a chocolate candy into the center of each cookie. Let cool 10 minutes on the baking sheets, then transfer to wire racks to cool completely. Repeat with the remaining dough.