How to Make It
Preheat the oven to 500°. Heat the olive oil in a large skillet. Add the sliced onions, season with salt and pepper and cook over moderate heat, stirring occasionally, until the onion is softened, about 4 minutes. Add the garlic and cook for 1 minute. Add the wine and cook until evaporated, 3 to 4 minutes. Remove the skillet from the heat.
On a lightly floured surface, roll out the pizza dough to a 12-inch round. Spray a baking sheet with olive oil cooking spray, sprinkle with cornmeal and transfer the dough to the sheet. Spread the onion on top and sprinkle with the Gorgonzola and 1/4 cup of the Parmesan.
Bake the pizza for 10 to 12 minutes, or until the crust is golden. Sprinkle with the arugula, toasted walnuts and the remaining 1/4 cup of Parmesan. Slice into wedges and serve.