Preheat oven to 350°F. Line a baking sheet with parchment paper and set aside.
In the bowl of a stand mixer fitted with the beater attachment, beat the butter and sugars until creamy, about 2 minutes.
8 tablespoons salted butter, ½ cup granulated sugar, ¼ cup dark brown sugar
Add the vanilla and egg and beat on low for 15 seconds. It's important not to overbeat the egg so that your cookies stay soft.
1 large egg, 1 teaspoon pure vanilla extract
Add the flour, corn starch, baking soda, and salt. Mix until it becomes crumbly (this is crumblier than a normal dough.)
1½ cups Bob's Red Mill 1:1 Gluten Free Flour, ½ teaspoon Bob's Red Mill Corn Starch, ½ teaspoon Bob's Red Mill Baking Soda, ¼ teaspoon coarse kosher salt
Add in the chocolate chips and beat until just combined. Use your hands to bring the dough together and form a large ball.
1 cup milk chocolate chips
Make 1½-inch balls with the dough and place them on the baking sheet, spaced out quite a bit to allow for spreading.
Bake for 10-11 minutes and remove from the oven. Trust me on the time; you do not want to overbake. They'll look puffy and just barely browned on the edges. Allow to rest on the hot baking sheet for at least 15 minutes and they will flatten a bit and be just perfect!