Scald milk. Remove from heat, then add water. Stir and let sit. Stir in yeast and sugar. Let mixture bloom. Stir in butter and egg. Add liquid ingredients in a mini stand mixer and beat.
In a bowl, whisk together both flours with salt and sugar. While the mixer is running, add dry ingredients. Knead. Place dough in an oiled bowl. Toss to coat. Let rise.