Preheat oven to 350°F. Butter 9-inch pie tin. Combine all dry ingredients mixing well. In separate bowl mix eggs, oil and vanilla. Mix into dry ingredients with spatula. Pour batter into prepared pan. Sprinkle nuts on top and gently press. Bake about 20 minutes until top is dry and toothpick inserted in center comes out with moist crumbs still attached. Serve warm with ice cream or whipped cream.