Preheat oven to 475.
Spray 18 x 13 sheet pan with Pam and lay parchment paper down.
Add flour, powered milk, sugar, yeast, and salt to a large bowl. Whisk to blend.
Add oil to warm water. Pour into flour mixture. Stir with a wooden spoon until batter forms. Don’t worry about lumps – you just want no dry spots.
Spread dough onto sheet pan with fingertips until even. If the dough doesn’t want to cooperate then let it rest for 5 min and try again.
Bake just the crust for 8-10 min. Remove from oven and set aside.
filling:
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