Dissolve yeast in warm water in a small bowl; let stand 5 minutes. Combine 2 cups flour, sugar and salt in a large bowl; stir in yeast mixture and oil. Add enough milk to make a soft dough. Cover and let stand 15 minutes.
Turn dough out onto a floured surface. Knead 5 to 8 times, working in remaining 1/2 cup flour to make a smooth dough. Pat dough evenly in bottom and halfway up sides of a lightly greased 10-inch cast iron skillet. Bake at 425 degrees F for 8 minutes.
Spoon sauce over crust. Top with any toppings desired. Sprinkle shredded Mozzarella cheese over the top. Bake 10 to 12 minutes or until cheese melts.