Trim the crusts from the bread slices and place the crusts evenly on the bottom of a lightly greased 9x13-inch baking dish. Layer the bread slices, sausage, Brie and Parmesan cheese in the baking dish. Whisk 5 eggs and 2 cups whipping cream in a bowl. Add the milk, sage, seasoned salt and dry mustard and mix well. Pour over the bread layers. Chill, covered, for 8 hours.
Whisk 2 eggs and 1 cup whipping cream in a bowl. Pour over the prepared layers. Bake at 350 degrees for 1 hour or until the center is set and a knife inserted in the center comes out clean.
You may substitute half-and-half for the whipping cream if desired.
Notes
I used half-and-half for the 2 cups whipping cream. I set casserole out for approximately 1 hour before baking. Casserole took over 1 hour to bake – approximately 1.5 hours.