In a medium-large bowl, add the vegan butter and granulated sugar. You can use a stand-mixer or hand mixer if preferred. Cream together, then stir in the oat milk and vanilla extract.
In a different bowl, add the flour, cornstarch, baking powder and salt. Stir to combine.
Transfer the dry ingredients to the wet ingredients and combine. Use your hands if needed. The dough will be dry, but it should hold together when pressed. Place a large piece of parchment paper on a clean surface and add a small amount of flour. Place the cookie dough on the parchment paper and roll out the dough to approximately ¼ inch thick, making a large circle. Cover and transfer the dough to the refrigerator to chill for 1 hour.
When you’re ready to bake the crust, preheat the oven to 350°F. Line a large baking sheet with parchment paper. Remove the crust from the refrigerator while the oven preheats.
Bake for 12 minutes at 350°F. Let the crust cool completely before decorating.
Once the crust has cooled completely, spread the plant-based yogurt on top and decorate with your favorite fruits. Enjoy!