Lightly oil a large (16 by 30-inch) cookie sheet, or 2 smaller (11 by 17-inch) sheets.
Using a rolling pin or your hands, flatten dough to fit in your cookie sheet. Using finger tips, poke indentations across entire surface. Spread a thin layer of tomato sauce over surface. Sprinkle with olives. Lay anchovy fillets out into a pattern. Sprinkle with onions, capers, and drizzle with extra virgin olive oil. Place in oven and bake 15 to 20 minutes, until golden brown on bottom. Remove and serve hot or cold.