In a flexible, silicon loaf pan or a standard loaf pan lined with parchment, combine all dry ingredients, stirring well.
Whisk maple syrup, oil, and water together in a measuring cup.
Add this to the dry ingredients and mix very well until everything is completely soaked and dough becomes very thick (if the dough is too thick to stir, add one or two teaspoons of water until the dough is manageable).
Smooth out the top with the back of a spoon. Let sit out on the counter for at least 2 hours, or all day or overnight. To ensure the dough is ready, it should retain its shape even when you pull the sides of the loaf pan away from it or lift the parchment.
Preheat oven to 350° F / 175° C.
Place loaf pan in the oven on the middle rack, and bake for 20 minutes. Remove bread from loaf pan, place it upside down directly on the rack and bake for another 30 to 40 minutes. Bread is done when it sounds hollow when tapped.
Let cool completely before slicing.
Store bread in a tightly sealed container for up to five days. Freezes well too – slice before freezing for quick and easy toast!