Preheat the oven to 375 degrees
Add 6 liners to a jumbo muffin pan, set aisde
Prepare the crumb topping in a small mixing bowl. Add the crumb topping ingredients to the bowl, then use a fork to mix it all together to form a crumb type mixture. Set aside in the refrigerator.
Add the the flour, baking powder, and pumpkin pie spice to a large bowl and mix with a large spoon
Add the sugar, pumpkin, oil, and eggs to a medium bowl and stir with a whisk until well combined
Pour the pumpkin mixture into the bowl with the flour mixture and gently stir just until combined
Divide the mixture between the muffin tin cavities
Remove the crumb topping from the refrigerator, stiff with the fork to form crumbs, and sprinkle the mixture over the muffin batter
Bake the muffins for 22-25 minutes, until a toothpick inserted into middle of a muffin comes out clean
Transfer the pan to a wire rack to cool for a few minutes, then remove from the pan