Creating delicious Pumpkin Crumb Cake Muffins is straightforward if you follow these clear steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C) and line a muffin tin with paper liners.
2. Mix Dry Ingredients: In a large bowl, whisk together the flour, sugar, baking powder, baking soda, salt, cinnamon, and nutmeg until evenly combined.
3. Combine Wet Ingredients: In another bowl, whisk the pumpkin puree, vegetable oil, eggs, and vanilla extract until smooth.
4. Combine Mixtures: Gradually add the wet ingredients to the dry ingredients, stirring until just mixed. Avoid overmixing; a few lumps are okay.
5. Prepare the Crumb Topping: In a separate bowl, combine flour, brown sugar, and cinnamon. Pour in the melted butter and mix until crumbly.
6. Fill Muffin Tins: Divide the pumpkin batter evenly among the muffin cups, filling each about three-quarters full.
7. Add Crumb Topping: Sprinkle the crumb topping generously over each filled muffin cup.
8. Bake: Place the muffin tin into the preheated oven and bake for 25-30 minutes or until a toothpick inserted comes out clean.
9. Cool Off: Once baked, remove muffins from the oven and let them cool in the pan for about 10 minutes before transferring to a wire rack to cool completely.

These steps will guide you in creating incredible Pumpkin Crumb Cake Muffins without hassle.