Combine the first eight ingredients in a bread machine and start the dough-making cycle. If you are using refrigerated pizza crust dough, skip this step.
Brown the sausage with the onion and green pepper, if using. Drain and set aside until needed, or refrigerate if making pizza dough from scratch.
Grease two 18 by 13-inch baking sheets (size may vary, that’s okay). Preheat oven to 425 degrees if using refrigerated pizza crust dough. If making dough in the bread machine from scratch, preheat oven when the dough is prepared to spread in the pans.
Spread dough in pans until it reaches the edges, or as close as you can come to the edges. Mix pizza sauce if using homemade. (You may have some sauce left over if you are just making one school breakfast pizza.) Spread pizza sauce over dough up to about 1/2 inch from the edge of the crust.
Sprinkle the cooked sausage mixture over the top of the sauce. Sprinkle cheese over the top of the sausage mixture. Bake in the oven for 20-25 minutes. If baking two pizzas, exchange the top and bottom pizza about half way through the baking time so both get cooked evenly on top.
When pizza comes out of the oven, slice and serve.