01 - 
                When ready to bake, preheat oven to 350°F.
              
              
              
                02 - 
                Arrange six slices of bread in the bottom of a greased baking dish.
              
              
              
                03 - 
                Top each piece of bread with a slice of cheddar cheese.
              
              
              
                04 - 
                Place a slice of bread on top of each cheese slice to create sandwiches.
              
              
              
                05 - 
                Whisk together egg yolks or eggs, milk, salt, pepper, and mustard in a bowl.
              
              
              
                06 - 
                Pour the custard mixture over the sandwiches evenly.
              
              
              
                07 - 
                Refrigerate until the bread has softened.
              
              
              
                08 - 
                Bake for 1 hour or until the top is golden brown.