Step 1

Preheat the oven to 350°F. Grease a 9-x-13-inch baking dish.

Step 2

In a large bowl, mix flour, sugar, baking powder, salt, milk, eggs, and vanilla together.

Step 3

Slowly stir in melted butter and pour batter into the prepared baking dish.

Step 4

Make the cinnamon topping: In another bowl, mix softened butter, brown sugar, flour, and cinnamon. Dollop over the top of the cake mixture evenly.

Step 5

Swirl your topping and cake mixture with a knife, only inserting it halfway into the cake batter and going up and down the length of the pan.

Step 6

Bake for 28–32 minutes.

Step 7

Meanwhile, mix all glaze ingredients together in a small bowl. Drizzle over the cake while it is still warm.