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In a medium mixing bowl, combine pumpkin puree, Lee Kum Kee Plum Sauce, oil and beaten egg. Mix well.
                         
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Stir in flour, baking powder, baking soda, cinnamon, vanilla, milk and chocolate chips. Mix well.
                         
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Line cupcake pan with muffin cups. Spoon mixture into muffin cups about 3/4 way to the top.
                         
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Place tray in the oven. Bake at 175°C for 15-20 minutes until muffins are done.