1) Whisk together the milk, hot water, and olive oil. The hot water should heat the milk so that the entire mixture is lukewarm. Set it aside.
2) In a separate, larger bowl, whisk together the salt, Pizza Dough Flavor, sugar, dry milk, potato flour, all-purpose flour, and yeast.
3) Add the wet ingredients to the dry ingredients, stirring to combine.
4) Mix and knead the mixture — by hand, using a stand mixer, or in a bread machine — to make a smooth, soft dough.
5) Place the dough in a lightly greased bowl or a large (8-cup) measuring cup, cover it, and allow it to rise till doubled, 60 to 90 minutes.
6) Gently deflate the dough, and transfer it to a lightly greased work surface.
7) Roll the dough into a 12" x 18" rectangle.
8) Spread evenly with the 1 cup cheese, and the browned sausage, gently pressing them into the dough.
9) Starting with a short end, roll the dough into a log. Cut the log into 12 pieces.
10) Space the rounds on two parchment-lined or lightly greased baking sheets, six to a sheet. Flatten each to about 1/2" thick.
11) Cover the pan, and allow the buns to rise for 60 to 90 minutes, till they're nicely puffed. Towards the end of the rising time, preheat the oven to 350°F.
12) Bake the buns for 15 minutes. While the buns are baking, combine the tomato sauce with the Pizza Seasoning and 2 teaspoons sugar, if you're using them.
13) Remove the buns from the oven, and brush each with a generous tablespoon of sauce. Sprinkle with about 1/4 cup shredded cheese.
14) Return the buns to the oven, and bake until their edges are golden brown, and the cheese is melted, about 15 to 20 minutes.
15) Remove from the oven, and serve warm. Store any leftovers in the refrigerator. Reheat for about 10 minutes, covered, in a 350°F oven; or very briefly in a microwave.
Yield: 12 pizza buns.