Preheat: Set your oven to 350°F. Position a rack in the center. Grease a 9x5-inch loaf pan thoroughly with butter or non-stick spray.
Whisk Dry Ingredients: In your first bowl, combine the flour, sugar, baking soda, cinnamon, salt, baking powder, nutmeg, and cloves. Whisk until everything is evenly distributed.
Mix Wet Ingredients: In the second bowl, whisk together the eggs, canned pumpkin, canola oil, and water. Make sure it's smooth and fully combined.
Combine (The Critical Step): Pour the wet ingredients into the dry ingredients. Stir with a spatula or wooden spoon just until moistened. Stop as soon as the flour streaks disappear. A few tiny lumps are perfectly okay — overmixing is what makes quick bread tough.
Fold in Add-Ins: If you're using walnuts and raisins, gently fold them in now. A few turns of the spatula is all it takes.
Bake: Pour the batter into the prepared loaf pan and spread it even. Bake for 65 to 70 minutes. The loaf is done when a toothpick inserted into the center comes out clean, or a digital thermometer registers 200°–205°F in the center. The edges will pull away from the pan, and the top will be a deep golden brown with a crack down the middle.
Cool in Pan: Let the bread cool in the pan on a wire rack for exactly 10 minutes. This allows it to set so it doesn't fall apart when you remove it.
Remove from Pan: Run a thin knife along the edges of the pan to loosen any sticky bits. Gently shake the pan to release the bread. Turn it out onto the wire rack, right side up.
Cool Completely: Let the loaf cool completely on the wire rack before slicing. This is absolutely crucial — slicing too early will make the bread crumble and seem gummy. It usually takes about 1-2 hours.