Caramelized Onion-Tomato Tart

1 (9-inch) baked piecrust
3 tablespoons olive oil
1 large onion, thinly sliced
4 oz. crumbled goat cheese
4 large tomatoes, peeled and thinly sliced crosswise
½ cup fresh basil leaves

In skillet, cook onion in 2 tablespoons of olive oil over low-medium heat for 20 minutes until golden brown. Spread caramelized onion on bottom of piecrust. Top with 1/3 goat cheese crumbles. Top with layers of tomato, basil, and goat cheese, ending with tomatoes on top of pie. Sprinkle with salt and pepper to taste, and drizzle with remaining tablespoon of oil. Bake tart at 375º F for 35 minutes or until bubbly. (Crimp foil on crust edges, if needed, to prevent over-browning.)