Step 1

Preheat oven to 350°F (177°C). Lightly grease your pizza pan.

Step 2

Whisk the flour, cornstarch, baking soda, and salt together in a medium bowl. Set aside.

Step 3

Using a hand mixer or a stand mixer fitted with a paddle attachment, cream the butter and both sugars together on medium speed until smooth, about 2 minutes. Add the egg and beat on high until combined, about 1 minute. Scrape down the sides and bottom of the bowl as needed. Add the vanilla extract, then mix on high until combined.

Step 4

Add the dry ingredients to the wet ingredients and mix on low until combined. With the mixer running on low speed, add the chocolate chips. Dough will be thick and soft.

Step 5

Transfer the cookie dough to the pizza pan and flatten out with your fingers or a rubber spatula until the edges reach the sides (or just about to the sides).

Step 6

Bake for 22-25 minutes or until puffed and lightly browned on top. If you want the cookie pizza a little crispier on the edges, bake for a couple extra minutes. Allow the cookie pizza to cool on the pan set on a wire rack before slicing. Cover leftovers and store at room temperature for 2-3 days or in the refrigerator for up to 5 days.