1. To make Dough: Dissolve brown sugar in ½ cup warm water in large bowl. Stir in yeast, and let stand 5 minutes, or until liquid is cloudy and bubbly. Stir in whole-wheat flour, ¼ cup all-purpose flour, flax meal, oil, and salt. Knead 2 minutes while adding ¼ cup flour. Oil separate bowl, and turn dough in oil to coat. Cover, and let rise in warm spot until dough doubles in size, about 45 minutes.
2. Preheat oven to 475°F. Oil bottom and sides of 12-inch cast iron skillet. With floured hands, pat and stretch Dough over bottom and halfway up sides of skillet. Let dough rest 5 minutes. Spread 1 cup cheese, then sauce, then 1 cup cheese, optional veggies, then remaining 1 cup cheese. Sprinkle with oregano. Place skillet directly on oven floor, and bake 15 minutes. Remove carefully from oven, and let stand 5 minutes before serving.