Challah French Toast with Mango

*Every Shabbat I buy too much challah, on purpose.  The reason: leftover challah bread makes the best French toast you will ever put in your mouth!  I ngredients 6 large eggs 3/4 cup milk 3/4 cup heavy cream 1 teaspoon vanilla 1/4 teaspoon cinnamon 2 tablespoons butter, divided 8 (1-inch-thick) slices challah bread 3 cups mangos,…