In the bowl of a stand mixer or a large bowl with a hand mixer, cream butter until smooth, for about 1 minute. Add sugar and beat until light and fluffy, scraping the sides as needed. Beat in egg and vanilla
Add flour, salt, baking powder, baking soda, and cornstarch on top of the wet ingredients. Gently stir dry ingredients together, before mixing on low speed to combine wet and dry ingredients.
Cover dough and refrigerate for at least 30 minutes, up to 1 day.
Preheat oven to 35Grease a 12 inch pizza pan. Press refrigerated dough into pizza pan, in an even circle. Bake for 14-16 minutes, or until very lightly golden brown. Do not over bake, or the crust will be brittle. Allow crust to cool completely before decorating.
Brown Sugar Cream Cheese Frosting
In the bowl of a stand mixer or in a large bowl with a hand mixer, cream together butter and cream cheese until smooth and fully combined.
Add brown sugar and cream for 2 minutes.
Add powdered sugar, 1/2 c at a time, beating well with each addition. Add vanilla and salt and allow the mixer to run for 2-3 minutes, until frosting is smooth and light.
Spread over cooled cookie crust and decorate with fruit as desired. Blueberries, strawberries, blackberries, kiwi, sliced grapes, raspberries, and mango are all delicious. Leftovers keep covered in the fridge for up to 3 days.
Notes
Cookie recipe adapted from sallysbakingaddiction.com/fruit-pizza/