In a medium bowl, sift together the flour, baking soda, salt, and cornstarch. Set aside.
2 1/2 cups All-purpose flour, 1 tsp Baking soda, 1 tsp Salt, 2 tsp Cornstarch
Use a mixer, and beat the brown butter, sugar, and brown sugar on high speed for 2 minutes. The butter should be light and fluffy. Add in the vanilla and eggs. Mix until combined.
1/2 cup White granulated sugar, 1 cup Brown sugar, 1 tsp Pure vanilla extract, 2 Large eggs
Add in the dry ingredients on low. Mix until just combined. Add in the chocolate chips and mini chocolate chips and mix on low until just combined.
1 1/2 cup Semi-sweet chocolate chips, 1/4 cup Mini chocolate chips
Preheat oven to 350F, and line 2 cookie sheets with parchment paper. Let the cookie dough sit for 10 minutes to avoid over spreading.
Use a large cookie dough scoop (2 tablespoons) to scoop the dough. Place 6 cookie dough balls for cookie sheet.
Bake the cookies for 10-13 minutes until lightly golden brown on the edges and on top. Let the cookies sit on the pan for 4 minutes, then transfer to a cooling rack.