To make the dough ~

1. Place the yeast, sugar, and warm water in the bowl of a standing mixer fitted with a dough hook. Let sit for 5 minutes to activate the yeast.
2. With the mixer on low, add the kosher salt and the flour a half cup at a time. Mix thoroughly. The dough will be dry and crumbly.
3. Add the whole egg, egg yolks, melted butter, minced onions and Parmesan cheese and mix to combine. After the dough is combined, mix/knead on low for 8 minutes. Alternately, knead by hand for 8 minutes.
4. From the dough in a ball. Place the dough in a large bowl and cover with plastic wrap and a clean kitchen towel. Let rise for 1 hour.

To assemble the pizza ~

1. Preheat oven to 450 degrees F. Place a pizza stone on the middle rack.
2. Sprinkle a little cornmeal on the bottom of the deep dish pizza pan.
3. Divide the dough in half. One a very lightly floured surface, roll out 1 piece of the dough to a 16 inch circle. 
4. Lay the rolled out dough in the bottom of the pan.
5. Sprinkle 3/4 of the shredded mozzarella on the dough making sure to not sprinkle the cheese on the outermost 1 inch of the dough.
6. Sprinkle the crumbled and cooked Italian sausage on top of the cheese.
7. Roll out the remaining piece of dough to a 16 inch circle. Lay the dough evenly over the bottom dough and fillings. Roll and crimp the edges to form the crust. (see photo in post)
8. Spread about 3/4 cup of the sauce on top of the pizza. Sprinkle the remaining mozzarella cheese on top of the pizza.
9. Bake in the oven for 25 to 30 minutes. Start checking the pizza at 20 minutes. The crust will be golden brown and the cheese will be slightly charred in spots when the pizza is done.
10. Remove the pizza from the oven and let cool for 5 minutes.
11. Cut into wedges. Warm the marinara or pizza sauce and serve on the side for dipping.