potatoes5 medium sized russet potatoes - skinned chopped into large chunks 1 cup milk - 1/4 cup butter - (1/2 stick) 1/3 cup sour cream - 1 cup cheddar cheese - divided meat/veggies8 slices bacon - cubed 1.5 pound ground beef - i used 93% 1/2 onion - chopped 1 zucchini - medium sized, cut into cubes 3 ga