Mix the pumpkin, milk, eggs, sugar and pumpkin pie spice in a bowl with a whisk.
1 15 oz can pumpkin puree, 1 10 oz can evaporated milk, 3 eggs, 1 cup brown sugar, 3 tsp pumpkin pie spice
Pour the pumpkin pie filling in a greased 9x13 baking pan.
Sprinkle yellow cake mix evenly over the top.
1 15.25 oz box yellow cake mix
Pour melted butter over the cake mix.
1 cup butter
Bake at 350° for 45-50 minutes, until center is set and a toothpick come out clean.
Frosting Glaze
Mix the powdered sugar, milk and vanilla in a bowl with a whisk until smooth. Pour over the top of the cake while it's still warm. Let it cool and harden to a sweet crackled glaze on the top.