Preheat your oven to 350°F (175°C) and grease a 9×13-inch baking pan.

In a large mixing bowl, whisk together the dry ingredients: flour, baking powder, baking soda, salt, cinnamon, nutmeg, and ginger.

In a separate bowl, combine the wet ingredients: granulated sugar, brown sugar, vegetable oil, eggs, pumpkin puree, and vanilla extract. Beat until smooth.

Gradually mix the dry ingredients into the wet mixture until just combined.

In a small bowl, mix together powdered sugar, honey, cinnamon, and milk until smooth and pourable.

Pour half of the cake batter into the prepared pan, drizzle with half of the swirl mixture, then layer the remaining batter and swirl mixture. Create a marble effect with a knife.

Bake for 30-35 minutes or until a toothpick inserted comes out clean.

Let the cake cool in the pan for 10-15 minutes before transferring it to a wire rack to cool completely.