Cinnamon Roll Cake

I don't make cinnamon rolls from scratch, so this was a perfect alternative for me.
Cake Portion:
3 c. of flour
1/4 tsp. of salt
1 c. of granulated sugar
4 tsp. of baking powder
1 1/2 c. of milk
2 eggs
2 tsp. of vanilla(I always do like 3 cause I loves me some vanilla)
1/2 c. of melted butter

Cinnamon Mixture:
1 c. of butter, softened(yes, this calls for a lot of butter :)
1 c. of brown sugar
2 Tbsp. of flour
1 Tbsp. of cinnamon

Glaze:
2 c. of powdered sugar
5 Tbsp. of milk
1(or 2) tsp. of vanilla

Heat the oven to 350 degrees F.
Grease a 13x9 pan.  Mix all of the cake ingredients together, EXCEPT for the melted butter, in a mixer until it becomes smooth.  Slowly stir in the melted butter at this time.  Pour all of the cake batter into the pan.  Set aside.  Next combine ALL of the cinnamon mixture ingredients.  Mix until smooth.  Plop(yes, I said plop) spoonfuls of the mixture onto the cake batter.  Swirl with a knife until it looks all pretty and a little bit more evenly dispersed. Bake in the oven for about 28-32 minutes.
While the cake is baking make the glaze.  Put all of the glaze ingredients into a measuring pitcher and mix with a fork until smooth.  Once the cake is done baking, let it sit for about 10 minutes, then pour the glaze evenly over the cake.  Let it cool for about another 5 minutes and serve.  Reheat when you eat the leftovers, it's like reliving the whole experience of the first bite.  Enjoy!