Preheat the oven to 350F. Spray a 9x13 inch baking dish with cooking spray.
Make the cake batter
Put the eggs, milk, vanilla, melted butter and sugar in a bowl and mix until combined. Add the flour, salt, cinnamon and baking powder and mix until combined. Pour the batter into the baking dish.
Make the topping
Put butter, brown sugar, flour and cinnamon in a bowl and mix until combined.
Add the topping to cake
Drop the topping evenly on top of the cake batter by a tablespoon. Use a knife to swirl the topping throughout the cake.
Bake the cake
Put the cinnamon roll cake in the oven and bake for 40 minutes.
Glaze the cake
Mix the powdered sugar, milk and vanilla to make the glaze. Drizzle the glaze over the warm cinnamon roll cake.