Stir in melted butter, slowly. Pour into greased 9x13 pan.
Mix topping ingredients (3/4 cup butter softened, brown sugar, flour, cinnamon and pumpkin puree). Drop over cake mixture evenly.
Swirl your topping and cake mixture with a knife going up and down the length of the pan (but only inserting it in the cake mix a little - not all the way).
Bake for 32-35 minutes.
Top with the glaze which is made by mixing powdered sugar, pumpkin pie spice, milk, vanilla. Drizzle over the cake while it's still warm.