In a big bowl mix:
6 eggs
1/2 cup sugar
2 teaspoons vanilla
3 cups milk
2 teaspoons cinnamon
Pour bread into wet ingredients and mix just until bread is wet. Pour mixture into greased pan. Bake 15 minutes @ 350 degrees.
While baking, mix topping with hands:
1 cup butter
1 cup brown sugar
1 tablespoon cinnamon
Add topping and bake for another 15 minutes. Serve with syrup, berries, or whipped cream.