01 -
Preheat oven to 350°F. Line baking sheets with parchment paper or silicone mats.
02 -
In a large bowl, use an electric or stand mixer to cream together the softened butter, brown sugar, and granulated sugar until the mixture is light and fluffy. Scrape down the bowl sides with a rubber spatula as needed.
03 -
Add the whole egg, egg yolk, and vanilla extract to the creamed mixture and blend until fully incorporated and smooth.
04 -
In a separate bowl, whisk together the all-purpose flour, baking soda, baking powder, and ground cinnamon until evenly mixed.
05 -
Add the dry ingredients to the wet mixture and mix gently until a dough forms. Avoid over-mixing to maintain tender cookies.
06 -
Using a large cookie scoop (approximately 4 tablespoons), portion dough into balls and place them 2 inches apart on the prepared baking sheets. Press an indent into the center of each cookie ball using the back of the scoop.
07 -
Whisk flour, brown sugar, granulated sugar, and cinnamon in a medium bowl. Using a pastry cutter or fork, cut in the cold cubed butter until pea-sized crumbs form.
08 -
Evenly sprinkle the crumble topping over each cookie. Bake for 9 to 11 minutes, or until edges turn light golden brown. Allow cookies to rest on baking sheets for a few minutes before transferring to a cooling rack.
09 -
Whisk powdered sugar, vanilla extract, milk, and cinnamon in a small bowl until smooth. Adjust consistency with additional powdered sugar or milk as needed. Drizzle the glaze on slightly warm cookies to allow absorption.