Spray a 9x13-inch baking dish with Pam.
In a large bowl, wish together eggs, milk, yogurt, vanilla, brown sugar, nutmeg and cinnamon.
Add in chopped bread and stir together gently.
Pour mixture into baking dish.
Using a spoon, tuck a small dollop of cream cheese in between bread pieces, making sure to use the entire container.
Cover with foil and refrigerate overnight.
Before baking, remove dish from fridge and let sit out for 30 or so minutes.
Preheat the oven to 350 F.
Top casserole with small, cut pieces of butter.
Sprinkle top of casserole generously with extra sugar and cinnamon if desired.
Bake for 45 minutes or until knife inserted in the center comes out clean. Let sit for a few minutes before serving.