Combine seed mix for topping and soak ½ cup water with the seed mixture for the bread; let sit 30 minutes to overnight.
Mix flours, yeast, honey, melted butter, oats, and salt in a stand mixer; knead on medium for 6-8 minutes until elastic.
Add the soaked seeds and water; mix until fully incorporated. Let the dough rise until doubled, about 1 to 1.25 hours.
Preshape, shape into loaves, and let rest 10 minutes. Brush with beaten egg white, coat with seed topping, and place in loaf pans.
Let the loaves rise until nearly doubled, then bake at 375°F (190°C) for 35-40 minutes until golden and internal temperature reaches 185°F (85°C). Cool before slicing.
Notes
Ensure the dough is elastic and well-risen for best texture.