01 - 
                Butter a 9×13-inch pan. Spread croissant pieces across the bottom.
              
              
              
                02 - 
                Scatter your cooked sausage and grated cheese on top of the croissant base.
              
              
              
                03 - 
                In a big bowl, beat eggs, milk, powdered mustard, salt, and pepper until smooth.
              
              
              
                04 - 
                Drizzle egg mix over everything, then push down lightly so croissants soak up the liquid.
              
              
              
                05 - 
                Wrap with plastic and stick in the fridge overnight or at least 2 hours.
              
              
              
                06 - 
                Heat oven to 350°F (175°C). Take the dish out and let it warm up while oven heats. Cook without covering for 40-45 minutes until golden on top and firm in the middle.
              
              
              
                07 - 
                Let it cool a bit before cutting. Enjoy while warm.