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Export 9 ingredients for grocery delivery
Step 1
Preheat oven to 350F (175C) and line a 9x9 metal baking pan with parchment paper or grease and flour the sides and bottom of the pan.*
Step 2
Combine butter and sugars in a large bowl and stir until well-combined.
Step 3
Add eggs and vanilla extract and stir well.
Step 4
In a separate bowl, whisk together flour, cornstarch, baking powder, salt, and cinnamon (if using).
Step 5
Gradually add dry ingredients to wet until completely combined.
Step 6
Add oats and chocolate chips and stir until well combined.
Step 7
Spread cookie dough evenly into prepared baking pan and bake on 350F (175C) for 35-40 minutes or until a toothpick inserted in the center comes out clean or with a few moist crumbs.