Weigh 230 grams of soft white wheat berries and mill them into fine flour. In a small bowl, whisk together the freshly milled flour, baking soda, and salt. Set aside.
In a large mixing bowl, use a hand mixer or stand mixer fitted with the paddle attachment to beat the softened butter, peanut butter, granulated sugar, and brown sugar on medium speed until creamy and well combined.
Add the eggs one at a time, mixing well after each addition. Add the vanilla extract and beat until combined.
Gradually add the flour mixture to the wet ingredients and mix on low speed just until combined. Be careful not to overmix the dough.
Cover the bowl with plastic wrap and refrigerate for at least 30 minutes. This gives the freshly milled flour time to absorb the moisture while the dough firms up in the refrigerator, helping the cookies hold their shape during baking.
Preheat your oven to 375°F and line your baking sheets with parchment paper. Unwrap the Hershey’s chocolate kisses so they’re ready to press into the cookies when they come out of the oven.
Use a tablespoon or small 1” cookie scoop to portion the chilled dough into approximately 1-inch balls. Roll each ball in granulated sugar, then place them a few inches apart on the prepared baking sheets.
Bake for 8-10 minutes, or until the cookies look puffy, slightly cracked, and just set around the edges. Mine bake perfectly at 9 minutes. Be careful not to overbake them!
As soon as you remove the cookies from the oven, place a Hershey’s chocolate kiss in the middle of each one, pressing down just enough to create those classic cracks around the edges.
Leave the cookies on the baking sheets for a few minutes to firm up, then move them to a wire rack to finish cooling.