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Place the butter in a microwave safe mug and microwave for about 30 seconds, until melted.
Add the pumpkin, sugar, milk, and vanilla, and stir until smooth.
Add the flour, baking powder, pie spice, and salt, and stir again. Don't worry if it's a little lumpy. Your mixture should be very thick.
Stir in white chocolate if using, saving a few to sprinkle on top.
Microwave for about 1 to 2 minutes, depending on the strenght of your microwave. Mine come out perfectly after 90 seconds. Serve immediately.