Butter a 9 by 13 glass baking dish. Butter both sides of the bread and layer 6 of them into the bottom of the baking dish, overlapping them as necessary but keep them even. Layer the slices of ham on top of the bread and then the bananas, 6 more slices of bread, then the cheese, potato chips, and bacon. In a separate bowl, beat together the eggs, milk, cream, nutmeg, salt, and pepper. Pour this over the casserole almost to the top. Bake for 45 minutes until brown and bubbly. Cut into squares and remove with a spatula, like lasagna.