Dissolve dry yeast in warm water. Let stand 4-5 minutes.
Place flour, milk, sugar, and salt in mixer bowl. Using a whip, blend on low speed for 4 minutes.
Add dissolved yeast and oil. Blend on medium speed for 10 minutes. Batter will be lumpy.
Oil a sheet pan (18”x26”x1”). Sprinkle with cornmeal.
Pour batter into pan. Let stand for 20 minutes.
Prebake until crust is set: Conventional oven: 475 °F for 10 minutes
Combine onions, garlic powder, pepper, tomato paste, water, and seasonings. Simmer for 15 minutes.
Sprinkle ⅓ of shredded cheese evenly over each pizza crust.
Spread tomato mixture over cheese in pan.
Sprinkle remaining shredded cheese evenly over tomato mixture in each pan.
Bake until crust is lightly browned. Conventional oven: 475°F for 15-18 minutes. Convection oven: 450°F for 15 minutes.
Cut each pan 4x5