Preheat oven to 375 F and line muffin pan with 9 muffin cups
Melt butter in a small saucepan, be careful not to brown it
Place dry ingredients - 1 1/2 cups flour, 3/4 cup brown sugar, baking soda, cinnamon, cloves, nutmeg and salt in a mixing bowl and use a pastry cutter to mix together
In another mixing bowl - whisk together pumpkin puree, oil, eggs and vanilla until combined
Add dry ingredients to the wet ingredients and mix together with a spatula until just combined
In a small bowl, add crumb ingredients - 1/4 cup brown sugar, 1/2 cup flour, 1/2 teaspoon cinnamon and melted butter. Use a pastry cutter to combine. The mixture will be dense and not crumblike - that is perfectly fine
Spoon batter in muffin cups, fill them all the way
Take crumble in your hand and sprinkle as much as you want over the batter. I like just a moderate amount of crumble
Bake for 22 minutes or until done. Check to see if the muffins are done with a cake tester
Let cool in the pan for 5 minutes before transferring to a wire rack
Serve
Eat
Enjoy