Whisk together honey, oil and water until the honey has dissolved, then sprinkle active dry yeast across the top. Let sit for 10-15 minutes.
In a large mixing bowl, whisk together flour, oats, salt and cinnamon and let sit for 10 minutes.
Pour in the yeast mixture and mix everything together. Cover and let rise until the dough has doubled in volume, about 2 hours. It will be very sticky and well-hydrated. If you don’t intend to bake it right away, at this point you can place the bowl in the refrigerator, covered tightly with plastic wrap, where it will keep for up to 3 days.
Once you’re ready to bake, butter a 9x5-inch loaf pan. Sprinkle 1 tablespoon flour across the top of the dough. Using your hand or a dough scraper, scrape the dough away from the sides of the bowl, turning the bowl with your left hand until the dough begins to take the shape of a loaf. Lift the dough out of the bowl, turn it over and place it smooth side down onto a lightly floured surface, taking care not to completely deflate it. Flour your hands again and take one end and lift and fold 1/3 of the dough into the centre as if you were folding a letter. Repeat with the other end, then turn and place loaf seam side down. Nudge the dough into the shape of a loaf then place it into the buttered loaf pan. Set aside to let rise again, uncovered, for 1 hour or until it has risen just above the edges of the loaf pan.
Position a rack to the centre of the oven and preheat to 350ºF (177ºC). Bake for 50 minutes until the top is a rich, golden-brown colour and it sounds hollow when you tap on the top. Turn loaf out onto a wire cooling rack and let cool for 1 hour before slicing to allow the cooking process to complete.