Creating Pumpkin Crunch Cake is a simple yet rewarding process. Follow these easy steps to make this delightful dessert:

1. Preheat the Oven: Preheat your oven to 350°F (175°C) and grease a 9×13-inch baking dish.
2. Mix Pumpkin Base: In a large bowl, combine the pumpkin puree, granulated sugar, brown sugar, eggs, and vanilla extract. Mix until smooth.
3. Combine Dry Ingredients: In a separate bowl, whisk together the flour, baking powder, baking soda, cinnamon, nutmeg, and salt.
4. Combine Mixtures: Gradually add the dry ingredients to the pumpkin mixture, stirring until just combined.
5. Pour into Pan: Pour the batter into the prepared baking dish, spreading it evenly.
6. Prepare Crunch Topping: In a small bowl, mix the chopped pecans or walnuts with the cream cheese until well combined.
7. Add Topping: Drop spoonfuls of the cream cheese mixture over the pumpkin batter. Use a knife to swirl it slightly into the batter for a marbled effect.
8. Bake: Place the baking dish in the preheated oven and bake for 40-50 minutes or until a toothpick inserted in the center comes out clean.
9. Cool: Once baked, remove the cake from the oven and let it cool in the pan for about 30 minutes.
10. Prepare Whipped Cream (Optional): While the cake cools, whip the heavy cream with powdered sugar until soft peaks form.
11. Serve: Once cooled, slice the Pumpkin Crunch Cake and serve with whipped cream if desired.

These straightforward steps will guide you in creating this incredible Pumpkin Crunch Cake effortlessly.