Mix together ½ cup melted butter, 1 cup sugar, and 2 eggs
In a separate bowl, combine 3 cups flour, 4 tsp baking powder, and ½ tsp salt
Alternate adding dry ingredients and 1½ cups milk to the wet ingredients, ending with milk
Stir in 2 tsp vanilla
Pour batter into a greased 9x13 pan
In a small bowl, mix together 1 cup melted butter, 1 cup brown sugar, 2 Tbsp flour, and 1 Tbsp cinnamon
Drizzle the cinnamon mixture over the batter
Bake at 350°F for 30-35 minutes until a toothpick comes out clean
While cake cools slightly, whisk together 1½ cups powdered sugar, 3 Tbsp milk, and 1 tsp vanilla to make glaze
Drizzle glaze over warm cake and serve
