Mix the eggs, milk, pumpkin puree, vanilla, spices and brown sugar in a large shallow bowl or a glass pie plate for easy dipping.
Melt 1 1/2 tablespoons butter in a large skillet over medium heat.
Dip the bread into the egg mixture on both sides and grill in a skillet until lightly golden brown, about 2-3 minute per side. Repeat with remaining bread and butter as you will likely need to do several batches.
Serve warm with additional butter and maple syrup or with whipped cream.