Add warm water, warm milk, 1/2 c. softened butter, honey, and eggs to a bowl of a stand mixer (see notes if you don't have a stand mixer). Add 5 c. flour. Add salt to the side of the bowl. Add yeast to the center of the flour.
Affix mixer with dough hook. Mix on speed 1 for 5-7 minutes or until dough ball forms and cleans the sides of the bowl. Note: add more flour, 1-2 Tbsp. at a time, if the dough is too sticky and doesn’t form a ball.
Do not remove dough from bowl.
Cover the dough with a clean dish towel and allow to rise 45 minutes. Turn mixer to speed 1 again just to punch the dough down (about 10 seconds).
Turn dough out onto a cutting surface. Divide dough in half. Reserve half for another use (wrap in plastic wrap, then place in zip top bag, and freeze.) Divide remaining half of dough into 12 equal pieces. Roll each piece into a ball, and place in a greased 13X9 pan. Cover again with towel. Let rise 30 minutes.
Preheat oven to 350. Bake buns 20-25 minutes at 350 or until golden. Brush buns with remaining 1 Tbsp. melted butter and dust with garlic powder. Allow to cool 10 minutes before slicing. Slice in half with serrated or bread knife.