Combine dry ingredients in one bowl, and wet ingredients in another. Mix the wet mixture into the dry one, add melted butter, and stir until well combined. Grease the pan and pour the batter evenly into it.
Sprinkle a mixture of brown sugar and cinnamon evenly over the batter. Bake in a preheated 350-degree oven for approximately 30 minutes until fully cooked. Meanwhile, prepare a glaze by combining powdered sugar, vanilla, and water.