Preheat the oven to 350 degrees F and grease a 9x13" dish with coconut oil or another cooking fat of your choice.
Prepare the vanilla cake batter according to its instructions and pour into the baking dish.
Mix the ghee, cinnamon, sugar, and flour together to form the cinnamon-sugar swirl. Dollop it irregularly on top of the batter, then swirl in with a knife.
Bake 35 minutes or until a toothpick inserted in the center of the cake comes out clean.
Mix the glaze ingredients until smooth, using water as needed to thin into a nice drizzle. Allow the cake to cool at least 15 minutes before glazing and serving.