Preheat the oven to 350°F (175°C) and line an 8" x 8" (20cm x 20cm) pan with parchment paper or spray with baking spray.
In a medium mixing bowl, stir together the dry ingredients (flour through nutmeg).
1 cup (125 grams) flour, 1 teaspoon baking powder, 1/2 teaspoon baking soda, 1/4 teaspoon salt, 1 teaspoon ground cinnamon, 1/2 teaspoon ground ginger, 1/2 teaspoon ground nutmeg
In a large mixing bowl, whisk together the remaining cake ingredients (eggs through oil).
2 large eggs, 1 cup (228 grams) pumpkin puree, 1 cup (200 grams) unrefined sugar, 1/2 cup (120 ml) olive oil
Add the dry mix to the wet and stir just until combined. Do not overmix!
Pour into the prepared pan. Bake for 20-25 minutes or until a toothpick inserted in the center of the cake comes out clean.
Let cool completely before frosting.