Follow these simple steps to create your own Pumpkin Walnut Muffins:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Line a muffin tin with paper liners or grease it lightly.
2. Mix Dry Ingredients: In a medium bowl, whisk together the flour, baking powder, baking soda, salt, cinnamon, and nutmeg.
3. Combine Wet Ingredients: In a large bowl, beat the eggs, then add the pumpkin puree, granulated sugar, brown sugar, vegetable oil, and vanilla extract. Mix until well combined.
4. Combine Mixtures: Gradually add the dry ingredients to the wet mixture. Stir until just combined; be careful not to overmix.
5. Add Walnuts: Gently fold in the chopped walnuts.
6. Fill Muffin Tin: Divide the batter evenly among the muffin cups, filling each about two-thirds full.
7. Bake: Place the muffin tin in the preheated oven and bake for 20-25 minutes. A toothpick inserted into the center should come out clean.
8. Cool: Remove the muffins from the oven and allow them to cool in the tin for about 10 minutes. Then transfer them to a wire rack to cool completely.

These steps will guide you to create the most delicious Pumpkin Walnut Muffins with ease.