Cinnamon Roll cake

Another recipe from my Relief Society president!  She shared it on facebook, and I don't remember where it was shared from.

Cinnamon Roll Swirl Cake
3 cups flour
1/4 tsp salt
1 cup sugar
4 tsp baking powder
1 1/2 cup milk
2 eggs
2 tsp vanilla
1/2 cup butter, melted

Topping:
1 cup butter, still cold, but cut into small pieces
1 cup brown sugar
2 TB flour
2 TB cinnamon

Glaze, stir together:
 2 cup powdered sugar
5 TB milk
1 tsp vanilla

In a large bowl, mix all the ingredients for the cake together, except for the butter.  Once mixed; slowly pour in the butter, stir into the batter.
Pour into a greased 9x13 pan.  For the topping, cut the butter into brown sugar, flour and cinnamon using two knives, a pastry cutter, or by rubbing it together with your fingers until it looks like crumbs.
Drop evenly over the batter and swirl with a knife.

Bake at 350 for 30-40 minutes.

While the cake is warm, drizzle the glaze over the cake.