In the bowl of a stand mixer (or large mixing bowl for hand-kneading), carefully combine the boiling water, oats, honey, and dbutter. Stir until the butter melts. Let the mixture sit for about 20 minutes, until lukewarm (100°F-110°F) and thickened. The oats should be soft.
615 g (2½ cups) Water, 50 g (2Tbsp + 1Tsp) Honey, 71 g (5Tbsp) Butter, 110 g (1¼ cups) Rolled Oats
Add the salt, yeast, whole wheat flour, and all-purpose flour to the oat mixture. Using a stand mixer fitted with the dough hook attachment, knead on speed 2 for 8-10 minutes until a smooth, slightly tacky dough forms.
19 g (1Tbsp) Salt, 2 Packets (4½ tsp, 14g) Instant Yeast, 212 g (1¾ cup) Whole Wheat Flour, 600 g (5 cups) All Purpose Flour
Alternatively, knead by hand for about 12-15 minutes.
Shape the dough into a ball and place it in a lightly greased bowl. Cover with plastic wrap or a damp towel. Let rise in a warm, draft-free spot until doubled in size (about 1 hour).
Turn the dough onto a lightly floured surface and gently press to deflate. Divide it into two equal portions. Shape each portion into a loaf and place in greased 9x5-inch loaf pans.
Cover the pans with plastic wrap or a damp cloth. Let the dough rise for about 60-90 minutes, or until it rises just above the pan rim.
Preheat the oven to 375°F during the final 20 minutes of proofing. Bake the loaves for 35-40 minutes, or until they reach an internal temperature of 190°F. The tops should be golden brown and sound hollow when tapped.
Let the loaves cool in the pans for 5 minutes. Turn out onto a wire rack and cool completely before slicing.