Preheat the oven to 350. Lightly grease a 9x13 inch glass baking dish with non-stick cooking spray.
In a mixing bowl, whisk together the eggs and egg nog.
In another mixing bowl, blend together the pecans, brown sugar, cinnamon, nutmeg and butter with knives/forks/pasrty blender until crumbly.
Add a layer of the sliced bread to a 9x13 inch casserole, then spread out the pecan streusel, then top with another layer of the bread. Pour the egg nog-egg mixture over the top. Sprinkle a little cinnamon and nutmeg on top, covering lightly.
Bake in the preheated oven for 30 minutes covered with foil. Then remove the foil and bake another 25-3o minutes, or until casserole is cooked through and center bread is "springy."
Serve with maple syrup, syrup, powdered sugar or as is. Along with some fresh fruit, bacon or sausage...for a complete holiday brunch!