Flatbread with Onions and Mustard Seeds

Place dough in large bowl. Cover with towel and let rise in warm draft-free area until doubled, about 1 hour. Preheat oven to 450F. Heat 2 tablespoons oil in large nonstick skillet over medium heat. Add onions and garlic and saute until brown and tender, about 10 minutes. Add mustard, mustard seeds and thyme and stir 1 minute. Cool. Oil large baking sheet. Using rolling pin, roll out dough on floured surface to 14x5-inch rectangle. Spread 1/3 cup onion mixture evenly over dough. Starting at 1 short end, roll up dough jelly roll style. Using rolling pin, roll out dough to 12x8-inch rectangle. Transfer to prepared baking sheet. Brush with remaining 1 tablespoon oil. Sprinkle remaining onion mixture atop dough. Bake bread until golden brown, about 20 minutes. Serve warm or at room temperature. Makes 1 Flatbread