To start the pizza combine two boxes of Jiffy Pizza Crust with 1 cup warm water into a bowl. Stir to combine until there are no clumps then place a towel over the bowl and let rise 10 minutes.
While the crust rises in a pan over medium high heat cook the sausage. Breaking it up as it cooks into small bite size pieces. Halfway through add chopped onions and the can of mushrooms. Cook sausage completely through then set aside until the dough has risen.
Preheat oven to 425 degrees and grease a 9″x13″ cookie sheet (make sure it has an edge to it). Flour your hands a bit and take the dough out of the bowl and form to the sheet. Push the dough all the way to the edge and then up the sides a bit.
Take prepared sauce and top crust with it pushing to all sides. Top off with the sausage and mushrooms. Then add the shredded cheese.
Optional: Over the top of the cheese sprinkle 1/2 Tbs garlic powder then 1/2 Tbs Italian seasoning.