Cinnamon Roll Cake

what you need:
How to get this lovely cake:
Mix everything together except for the butter. 
Slowly stir in the melted butter and pour into a greased 9×13 pan. 
For the topping, mix all the ingredients together until well combined. 
Drop evenly over the batter and swirl with a knife. 
Bake at 350 for 28-32 min.
2 c. powdered sugar
5 Tbsp. milk
1 tsp. vanilla