01 -
In a medium bowl, combine the flour, brown sugar, cinnamon, and salt. Work in the butter until small clumps form. Refrigerate.
02 -
Preheat the oven to 400°F. Line two baking sheets with parchment paper or silicone baking mats and set aside.
03 -
In a large bowl, mix together the all-purpose flour, cake flour, cornstarch, cinnamon, baking soda, baking powder, and salt.
04 -
In a stand mixer with a paddle attachment, cream the cubed butter, brown sugar, and granulated sugar on medium speed for 1-2 minutes until smooth.
05 -
Blend in the egg, egg yolk, and vanilla extract. Scrape down the bowl as needed to ensure a thorough mix.
06 -
Gradually add the dry ingredients to the wet ingredients, 1/4 cup at a time, mixing until just combined.
07 -
Scoop and roll cookie dough into approximately 8 large balls (or smaller, yielding 22-24 cookies). Place on prepared baking sheets.
08 -
Using your thumb or a utensil, create an indent in each cookie. Add about 1 tablespoon of streusel filling to each indent.
09 -
Bake for 8-11 minutes or until the edges are set and slightly golden. Cool on the baking sheet for 5 minutes before transferring to a cooling rack.
10 -
Whisk melted butter, heavy cream, powdered sugar, vanilla, and salt in a small bowl until smooth.
11 -
Once the cookies are completely cool, drizzle icing over the tops and serve.