01 -
Preheat the oven to 350°F (177°C). Line a cookie sheet with parchment paper and set aside.
02 -
In a medium bowl, whisk together flour, pumpkin spice, and salt until fully combined.
03 -
In a large mixing bowl, beat cream cheese, butter, granulated sugar, and brown sugar on medium-high speed until light and fluffy, about 3 minutes. Scrape down the sides of the bowl.
04 -
Add the egg yolk and vanilla extract to the creamed mixture and blend until fully incorporated.
05 -
Gradually add the flour mixture in three additions, mixing thoroughly after each. Scrape down the sides as needed. Fold with a spatula to ensure no dry spots remain; dough will be thick.
06 -
Portion dough using a medium cookie scoop, rolling each into 2-tablespoon balls. Roll each ball in coarse sugar to coat and place on prepared cookie sheet, spacing about 2 inches apart.
07 -
For the filling, in a small bowl, combine the whole egg, brown sugar, pinch of salt, and whole milk. Whisk until smooth and set aside.