Preheat the oven to 350°. Spray a Bundt pan with baking spray (nonstick spray that has flour in it).

In a medium bowl, combine flour, salt, baking soda and pumpkin pie spice. Mix together and set aside.

In a large bowl, beat the sugar, oil, eggs and vanilla for about 2-3 minutes. Add the flour mixture and mix everything until just combined. Fold in the chopped apples and walnuts.

Pour the batter into the greased bundt pan and bake for about 50-55 minutes or until a cake tester inserted in the middle comes out clean.

Let the cake cool in the pan for about 10-15 minutes before inverting and cooling on a wire rack.

Make the glaze while cake is cooling. You'll want the cake to still be warm when you drizzle the glaze on. In a small saucepan, bring brown sugar, butter and milk to a boil over medium heat. Boil for one minute, stirring occasionally. Spoon all of the glaze over the cake.