In a bowl, mix together the brown sugar, cinnamon, nutmeg and chopped pecans and set aside.
Place the butter in a microwave safe bowl and place in the microwave. Melt the butter in 20 second intervals and then pour it into a 9x 13 casserole dish. Set aside.
In another bowl, whisk eggs, milk and vanilla together.
Lay a single layer of the Texas Toast in the casserole dish on top of the melted butter.
A traditional 9X13 casserole dish can fit 6 slices of Texas Toast on the bottom of the dish.
Sprinkle half of the brown sugar mix over the bread.
Layer the second half of the Texas Toast on top of the first layer.
Pour the egg mixture over the bread slices, making sure all are covered evenly.
Sprinkle the remaining brown sugar mixture on top.
Cover with aluminum foil and refrigerate overnight.
The Next Morning:
Remove the casserole dish from the refrigerator and cover with a new piece of foil.
Let it stand at room temperature for about 20 minutes.
Bake the casserole for 30 minutes in a preheated 350 degree oven.
Then uncover and bake for an additional 15 minutes.
The French Toast Casserole should be browned and set.
Cut and serve with warm syrup.
Notes
It's very important that you allow the casserole to come to room temperature before baking.
Do not move your glass casserole dish from one temperature extreme to the other. Let it sit on the counter top for about 30 minutes.
You can cover the casserole lightly with aluminum foil if you notice the bread is getting too brown while baking.