Preheat your oven to 350°F (175°C) and grease a 9x13 inch baking pan.

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

In another bowl, beat the eggs with granulated and brown sugar until slightly frothy, then mix in the vegetable oil and vanilla extract.

Fold in the grated carrots and apples into the wet mixture.

Gradually add the dry ingredients to the wet mixture, folding together until just combined.

If using, gently fold in the walnuts and raisins now.

Pour the batter into the prepared pan, spreading it evenly.

Bake in the oven for 40-45 minutes, checking for doneness with a toothpick.

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