Preheat your oven to 350 degrees Fahrenheit and prepare a 12-cup muffin tin, lining it with paper liners.
In a large bowl whisk together the pumpkin puree, eggs, sugar and vegetable oil.
Add the flour, baking soda, salt, cinnamon, cloves, ginger and nutmeg, and stir everything together with a rubber spatula just until no streaks of flour remain (don't over-mix!).
Divide the batter evenly between the muffin cups and set aside.
In a medium bowl whisk together the flour, sugar, and cinnamon.
Add the melted butter and combine with a fork just until a crumbly mixture forms.
Top each of the unbaked muffins with a spoonful of the streusel mixture, and bake at 350 degrees Fahrenheit for about 17-20 minutes, or until a toothpick inserted into one of the muffins comes out clean.
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Notes
These muffins are best enjoyed the day they're baked, but they do store in an airtight container at room temperature for up to 3 days.