Preheat the oven to 350 degrees F and grease a standard loaf pan (8-1/2 x 4-1/2 x 2-1/2 inches).
Make your flax egg: In a small bowl, combine the ground flaxseed and water. Set aside to thicken for 5 minutes.
1 tablespoon ground flaxseeds, 2 tablespoons water
Combine wet ingredients: In a large bowl, whisk together the pumpkin puree, brown sugar, white sugar, canola oil, flax egg and soy milk until smooth.
15 ounces canned pumpkin puree, 3/4 cup packed brown sugar, 1/2 cup white granulated sugar, 1/2 cup canola oil, 1/4 cup soy milk
Sprinkle in dry ingredients: Add the flour, baking soda, baking powder, salt, and pumpkin spice. Stir with a large spoon or spatula, gently, until just combined. Do not over mix.
1.5 cups all-purpose flour, 1/2 tsp salt, 1 tsp baking soda, 1/2 tsp baking powder, 3 tsp pumpkin pie spice
Bake: Pour into a greased or parchment-line loaf pan. Sprinkle your cinnamon crumble mixture on top. Bake for 55-65 minutes. Check around 50-ish minutes for doneness using a toothpick placed in the center at an angle. Tip: If your toothpick is gooey, cook at 5 minute intervals and continue checking for doneness. Cool: Let it cool for at least 15 minutes before slicing.