Follow these simple steps to create a mouthwatering Orange Pumpkin Spice Cake:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Grease and flour a 9-inch round cake pan.
2. Mix Dry Ingredients: In a large bowl, whisk together the flour, granulated sugar, brown sugar, baking powder, baking soda, spices, and salt until well combined.
3. Combine Wet Ingredients: In a separate bowl, mix the pumpkin puree, vegetable oil, eggs, vanilla extract, orange zest, and orange juice until smooth.
4. Blend Mixtures: Gradually add the wet ingredients to the dry ingredients, stirring until just combined. Avoid overmixing; a few lumps are okay.
5. Pour Batter: Pour the batter into the prepared cake pan, spreading it evenly.
6. Bake: Place in the preheated oven and bake for 40-45 minutes. A toothpick inserted in the center should come out clean.
7. Cool: Remove the cake from the oven, allow it to cool in the pan for 15 minutes, and then transfer it to a wire rack to cool completely.
8. Dust with Sugar: Once cooled, dust the top of the cake with powdered sugar if desired.

These steps will lead you to a successful baking experience, filled with delightful aromas and flavors!