Preheat oven to 350°F and coat baking dish with non-stick spray.
Whisk together the dry cake ingredients in a large mixing bowl.
In a different mixing bowl, whisk together the applesauce, milk, melted butter, vanilla and grated carrots.
Slowly pour the wet ingredients into the bowl of dry ingredients, mixing as you go. When fully incorporated, scoop batter into your prepared baking dish.
In a medium mixing bowl, whisk together the dry topping ingredients (you don't need the hot water just yet). Sprinkle this mixture on top of your cake batter.
Carefully pour the hot water on top of the cake and bake for 45-55 minutes, or until the middle is set.
Allow to cool for 10 minutes, then scoop and serve.
Notes
Nutrition information does not include the addition of ice cream.