Pre-heat the oven to 325℉¾
Using a hand grater or a food processor fitted with a grating blade, grate the zucchini. Place cheese cloth into a metal strainer over a large bowl. Put the grated zucchini into the cheese cloth and squeeze it until most of the water is removed.
Put the zucchini, eggs, pumpkin puree, and brown sugar into a large mixing bowl.
Using a wire whisk mix the ingredients together to combine them.
Add the pumpkin pie spice and the oil and continue to use the wire whisk to mix and combine the wet ingredients.
Then add the salt, baking soda, and baking powder to the mixture and using a rubber spatula stir to combine evenly. Add the flour to the bowl and using a rubber spatula fold the wet ingredients together with the flour mixture. Add the pumpkin seeds to the mixture (reserve about 2 Tbsps. to garnish the top of the bread with later). Mix the seeds in to combine evenly throughout the batter.
Prepare a loaf pan by spraying it with pan release spray or coating it with oil using a paper towel then dusting it with flour.
Pour batter into the prepared pan and place in a 325 ℉ oven for 55 minutes. Then turn the pan and continue to bake for another 55 minutes or until a toothpick inserted into the center comes out clean.
In a large bowl place, the white chocolate chips. In a small saucepan heat the heavy cream with the zest of an orange and bring it to a rolling boil. Pour the hot cream over the white chocolate chips and let it sit in order to melt the white chocolate.
Using a rubber spatula stir to combine the cream and the white chocolate chips creating the ganache. Let it sit at room temperature will the pumpkin zucchini bread bakes.
After 1 hr. 50 minutes or when a toothpick inserted into the center of the bread comes out clean, remove the pumpkin bread from the oven and place it on a wire rack to cool completely.
When the bread is cooled remove it from the pan and place it back onto the wire rack. Spread the white chocolate ganache over the top of the bread and garnish with whole pumpkin seeds. Slice and enjoy!