(If you would prefer to add cinnamon to the cake, add 1 tsp)
½ cup butter
1 cup brown sugar
¼ cup milk
Preheat oven to 350 degrees. Grease and flour a 9 x 13 baking dish.
Cake: In a large mixing bowl, beat together the oil, sugar, eggs, and vanilla. Add the flour, salt, and baking soda. Beat together until well-incorporated. Stir in the apples.
Pour the cake batter into the prepared baking dish. Bake for 55 – 60 minutes. Cool completely before adding the topping.
Topping: In a saucepan, combine the butter, brown sugar, and milk. Cook over medium heat, stirring constantly, until the mixture boils. Boil without stirring for 3 minutes. Remove from heat and immediately spread over the top of the cooled cake. Let sit for an hour prior to serving.