Preheat oven to 350 degrees
Line muffin tins with papers or spray with cooking spray. (recipe makes 24 muffins)
In mixer bowl combine pumpkin, sugar, oil, eggs, vanilla & molasses. Beat & blend until smooth.
Add in flour, cinnamon, ginger, pumpkin pie spice, baking soda & salt. Beat slowly until just combined.
Spoon batter into prepared muffin tins.
Make streusel by placing all streusel ingredients in small bowl & cut together with pastry cutter or by crossing 2 knives to cut the butter into the dry ingredients. Should be lumpy.
Sprinkle over the top of each muffin.
Bake muffins for 20-23 minutes or until toothpick test is clean.
Cool on wire rack & then drizzle with warmed Dulce de Leche before serving.