Pour butter into a 13x9-in. baking dish; set aside. In a large bowl, combine the flour, sugar, baking powder and salt. Stir in milk and vanilla until smooth. Pour into prepared pan. , In a large bowl, beat the pumpkin, evaporated milk and eggs. Combine the remaining filling ingredients; add to pumpkin mixture. Pour over crust mixture (do not stir). Dot with butter and sprinkle with sugar. , Bake at 350° for 55-60 minutes or until a knife inserted in the center comes out clean and the top is golden brown.