Preheat oven to 180 degrees C. Grease a 20x30cm baking tray.
In a large bowl, using a wooden spoon, mix together the eggs, oil, sugar and pumpkin until well blended. Combine the flour, baking powder, bicarb soda, salt, cinnamon, ginger, cloves and nutmeg; stir into the pumpkin mixture until just blended. Spread evenly into the prepared tray.
Bake for 25 to 30 minutes in the preheated oven, until bars spring back when lightly touched. Cool before cutting into bars.