Preheat the oven to 400 degrees. Spray a baking sheet with non-cook sticking spray.
Roll the pizza dough into a 9X13 rectangle. Partially bake the crust for about six to seven minutes. Remove from the oven and set aside.
Meanwhile, preheat a medium skillet to medium high heat. Add the mushrooms and cook for a minute or two. Next, add a little bit of olive to the skillet with yellow onion, salt and pepper. Continue to saute the mushrooms and onion until golden brown. Remove from the skillet and set aside.
In the same skillet as the mushrooms, melt the butter over medium heat. Add in the flour and begin to whisk. Keep whisking until a roux forms about a minute. Gradually pour in the cream, keep whisking. Turn the heat to a medium low and keep whisking until slightly thickened about four minutes. Stir in the garlic, Italian seasoning, salt, and pepper. Keep whisking until desired consistency is achieved.
Take the sauce and spread it on top of the pizza crust leaving a one-inch border all the way around. Top the white sauce with sauteed mushrooms, onions, burrata, and shredded mozzarella. Bake the pizza for about 15 minutes or until golden brown. Remove from oven and slice and enjoy!