Preheat the oven to 180°C/350°F/Gas 4. Grease an 8x4-inch loaf pan with butter or melted coconut oil.
Add the flax and water to a large mixing bowl and stir to combine. Set aside for 2-3 minutes until thickened.*
Whisk the flour, baking soda, baking powder, salt, pumpkin pie spice, and coffee granules in a small mixing bowl.
Add the pumpkin purée, both sugars, and coconut oil to the flax mixture. Whisk until smooth.
Fold the dry ingredients into the wet ingredients with a spatula or a large spoon and mix just until combined.
Gently fold the walnuts into the batter.
Transfer the batter to the prepared loaf pan. Bake for 55-60 minutes or until a toothpick inserted into the center comes out clean with a few moist crumbs and the top is golden brown.
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Allow the bread to cool to room temperature before slicing and serving. Enjoy!
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