Cinna-bun Cake

Ingredients:

3 cups flour

1/4 teaspoon salt

1 cup sugar

4 teaspoons baking powder

1 1/2 cups milk

2 eggs

2 teaspoons vanilla

1/2 cup butter, melted

Topping:

1 cup butter, softened

1 cup brown sugar

2 tablespoons flour

1 tablespoon cinnamon