Preheat oven to 325 degrees.
Grease and flour bundt cake pan.
Combine oil, eggs and sugar and mix together until smooth.
Combine flour, baking soda and 1 tsp. cinnamon together.
Add dry ingredients to wet and mix well. Batter will be stiff.
Fold in the apples, salt and vanilla.
Pour into bundt pan and sprinkle 1 tsp cinnamon over the cake in pan.
Bake at 325 for 1 hour.
Let cake cool.
Cook butter, brown sugar and half & half in saucepan over medium heat until melted and smooth.
Pull pan off heat and add the powdered sugar. Whisk until smooth.
Let sit for about 10 minutes before pouring over cool cake. You may need to pour part of glaze and come back to pour the rest in a few mintues, giving glaze time to set up a litte more. It will spill over into the middle of cake.
Top with chopped nuts if desired.