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1
Add 1 1/4 cups of the oats to a medium heatproof bowl. Pour the boiling water over them and stir to combine. Let sit, uncovered, for 10 minutes, stirring frequently.
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2
In the bowl of a stand mixer fitted with the paddle attachment, combine the soaked oats, room temperature water, 2 tablespoons of the honey, yeast, buttermilk, olive oil, both flours and the salt. Mix until a rough dough comes together, then switch to the dough hook and knead on low speed for about 10 minutes. When the dough is ready it will have a satiny finish, but it will still be somewhat wet and will cling to the dough hook (if necessary, you can add slightly more flour to the dough).
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3
Spray a large bowl with nonstick cooking spray then add the dough, turning to coat. Cover and let rise for 1 hour, or until just about doubled in size.
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4
Turn the dough out onto a floured work surface and press down to release excess air bubbles. Shape the dough into a 12x6-inch rectangle, with a long side facing you. Fold the sides in so they meet in the middle, then roll the dough into a log, starting with the end closest to you. Pinch the dough closed at the seam.
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5
Spray a 10-inch loaf pan (or at least 9 inches, this is a big loaf of bread) with nonstick cooking spray. Add the dough to the pan, seam side down, pressing it into the corners. In a small bowl, mix the remaining teaspoon of honey with 1/2 teaspoon of hot water. Brush the mixture over the top of the loaf then sprinkle it with the remaining 1/4 cup of oats.
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6
Let sit for about 30 minutes, or until the loaf rises just over the top of the pan. Meanwhile, preheat oven to 375 F. Bake the bread for 50-60 minutes, or until the internal temperature is about 200 F. Transfer the pan to a wire rack and turn the bread out. Let cool completely before slicing.
