In a medium bowl, sift the flour, baking soda, baking powder, salt, cream of tartar, and cornstarch. Set aside.
2 3/4 cup All-purpose flour, 1/2 tsp Baking soda, 1 tsp Salt, 1 tsp Cream of tartar, 1 tsp Cornstarch
Using a mixer, beat the butter, sugar, and brown sugar on high speed for 2 minutes.
1 cup Unsalted butter, 3/4 cup White granulated sugar, 3/4 cup Brown sugar
Add the vanilla and eggs and mix on medium until combined. Add the dry ingredients and mix on low speed until just combined.
1 tsp Pure vanilla extract, 2 Large eggs
Preheat the oven to 350℉. Line two cookie sheets with parchment paper. Let dough rest for 10 minutes to help with spreading. Combine sugar and cinnamon in a small bowl.
1/4 cup White granulated sugar, 1/2 TBSP Ground cinnamon
Use a large cookie scoop to scoop the dough. While it is still in the cookie scoop, use your thumb to create a hole in the center. Place a frozen dollop in the center and cover back up with the cookie dough. Roll each cookie dough ball in cinnamon sugar. Place 6 cookie dough balls per cookie sheet.
Bake for 13-15 minutes until the edges are lightly golden.
Let the cookies sit on the hot pan for 5 minutes before transferring to a cooling rack. Cool completely before icing.