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Heat water in Pyrex measuring cup for 1 minute in microwave on high. Stir in sugar and pour into a large mixing bowl. Add yeast and let stand for 5 minutes until yeast is activated.
Add 1 cup of white flour, then oil and salt. Continue to work in all but the last 1/4 cup of flour, moving to countertop when it becomes too difficult to stir in bowl. Knead until the dough feels smooth and springy. Lightly grease another mixing bowl with spray-on oil, place dough in bowl, and cover with a dish towel. Heat the oven for exactly one minute, then turn off and place the bowl inside the oven. Allow dough to rise until doubled, approximately 1 hour.
While dough is rising, mix oregano, basil, red pepper flakes, and garlic powder in a small bowl. Place Grillers in a Pyrex cup or mixing bowl and allow to defrost. Cut up vegetables and olives and divide into 3 portions.
Punch down dough in bowl and divide into 3 equal-sized pieces (each weighing about 15 ounces). Roll each ball of dough out with a rolling pin until it is the size of the pizza pan. Place dough on pans.
Cover each pizza with remaining ingredients in this order: tomato sauce, herb mixture, mushrooms, zucchini, bell pepper, olives, Grillers, spinach, cheese.
Bake at 475° for approximately 18 minutes, rotating placement of pizzas on oven shelves half-way through. Crust and pizza should both be brown when the pizza is done.
Slice each pizza into 8 slices. Each slice 170 calories.