1 loaf French bread, cut into 1-inch cubes (about 10 cups)
4 large eggs
1 cup whole milk
1/2 cup heavy cream
1/3 cup granulated sugar
1 tsp vanilla extract
1 tsp cinnamon
1/4 tsp nutmeg
3 ripe bananas, sliced
1/2 cup chopped walnuts
Additional walnuts and banana slices for garnish