Preheat the oven to 350
Line a baking sheet with parchment paper and set aside
Cream together butter and both sugars until light and fluffy.
Add in the egg and vanilla and mix completely.
Next sift in all purpose flour, salt, baking soda, baking powder and cornstarch.
Mix until it just comes together.
Using a large (3 tbsp) cookie scooper, form a ball of dough.
Roll dough in the crushed graham cracker
Place on baking sheet, press down the center with a tbsp measuring spoon
Bake for 10 mins
Remove from oven, press down on the center with a ¼ cup measuring cup
Return to the oven for 3 min
Remove and let cool fully.