Ingredients
3/4 C. butter, softened3/4 C. dark brown sugar
1/4 C. sugar
1 egg
1 T. vanilla
2 C. flour
2 tsp. cornstarch
1 tsp. baking soda
1/2 tsp. salt
1-1/4 C. chocolate chips or other mix in (M&M's, Reese's Pieces, Sprinkles, etc.)
Directions
Preheat oven to 350°F and line a 9" square pan with parchment paper. In a large bowl cream the butter and sugars together on medium speed until fluffy and light in color. Mix in egg and vanilla until combined. Slowly add flour, cornstarch, baking soda and salt and mix until combined. Stir in chocolate chips (or other item of choice). Press dough evenly into prepared pan and bake for 16 minutes or until the edges just start to turn brown. Do not over bake (you don't want to have to cut a cracker). Let cookie cool completely in pan. Frost as desired.Adapted from The Girl Who Ate Everything