In a small bowl whisk together all ingredients except for cheese and set aside until ready to use.
Bread
In the bowl of a stand mixer fitted with a dough hook stir together water, yeast and sugar. Allow to ferment for 5-7 minutes. Stir in 1 cup of flour, olive oil and salt. Begin kneading, adding additional flour by the 1/4 cup until dough starts to pull away from the sides. Continue to knead until dough is soft and silky, about 5-7 minutes.
Turn out dough into a large greased bowl, cover and allow to rise in a warm, draft free area until double in size, about 1 hour.
Preheat oven to 425℉. Oil a 10″ cast iron skillet and push dough evenly into pan with oiled fingers, creating dimples as you go. Allow dough to rest a few minutes to relax dough if having trouble pushing it out to the edge. Cover and allow to rise for 20 minutes.
Brush dough with mustard topping and sprinkle with parmesan cheese. Bake in preheated oven for 20-22 minutes until golden. Remove from oven and allow to cool a few minutes in pan before lifting out onto cooling rack. May be eaten slightly warm or at room temperature.