Preheat oven to 425 degrees F (220 degrees C). Grease a 9x13 inch baking pan.
Pour water into the bowl of an electric mixer fitted with a dough hook. Sift together flour, baking powder, and salt, and add to the water. Mix on medium speed until dough forms a ball. (Or, stir together water, flour, baking powder, and salt in large mixing bowl. Turn dough out onto floured surface and knead until it forms a ball.)
Plop dough into greased baking pan. Using oiled fingers, spread dough to 1/2-inch thickness. Dough will be sticky and elastic. It does not have to be perfectly even, but make sure there are no holes. Rub the top and sides of dough with olive oil. Season with cayenne, garlic salt, and basil.
Bake in preheated oven for 20 minutes. Remove from oven; sprinkle with Parmesan cheese and return to oven. Bake until just golden, or about 5 minutes.