Prepare an 18x13 inch sheet pan with cooking spray and line with parchment paper.
In a large bowl, whisk together the flour, powdered milk, sugar, yeast, and salt.
Stir the oil into the warm water, then pour into the dry ingredients. Mix with a wooden spoon until a shaggy dough forms with no dry flour remaining.
Using your fingertips, press and stretch the dough evenly across the prepared pan. If the dough springs back, let it rest for 5 minutes before continuing.
Par-bake the crust for 8-10 minutes until set but not browned. Remove from oven.