Beat butter + sugars for 2 min.
Add the eggs one at a time, then the vanilla.
Stir in dry ingredients. (flour, baking powder, salt)
Spread ⅓ batter on the bottom, sprinkle the cinnamon sugar on top.
Spread the remaining batter on top.
Spread with a spatula.
Bake 350°F (175°C) for 30–35 min.
Let it cool.
Beat the ingredients for the glaze, then drizzle.
