Making Pumpkin Streusel Muffins is a straightforward process. Follow these steps closely to ensure they turn out perfectly:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Line a muffin tin with paper liners or spray with cooking spray.
2. Mix Dry Ingredients: In a bowl, whisk together the all-purpose flour, whole wheat flour, baking soda, baking powder, salt, cinnamon, nutmeg, ginger, and cloves.
3. Combine Wet Ingredients: In a separate bowl, mix the pumpkin puree, granulated sugar, brown sugar, vegetable oil, eggs, and vanilla extract until well combined.
4. Combine Mixtures: Gradually add the dry ingredients to the wet mixture, stirring until just combined. If using nuts, fold them in gently.
5. Prepare Streusel Topping: In another bowl, mix oats, flour, brown sugar, cinnamon, and melted butter until crumbly.
6. Fill Muffin Tins: Spoon the batter into the prepared muffin tin, filling each cup about two-thirds full.
7. Add Streusel: Sprinkle a generous amount of the streusel topping on each muffin.
8. Bake: Place the muffin tin in the preheated oven and bake for 20-25 minutes. A toothpick inserted should come out clean.
9. Cool: Once baked, let the muffins cool in the tin for about 10 minutes, then transfer them to a wire rack to cool completely.

By following these steps, you will create a batch of Pumpkin Streusel Muffins that are sure to impress!