Pre-heat your oven to 450 degrees. Line two baking sheets with parchment paper and set aside.
Take out a small saucepan and combine the water through mustard. Set the stove to medium heat. Stir until the butter has melted and the mixture begins to boil. Add in the flour and lower the heat to low. Stir until the mixture comes together and pulls away from the sides of the pan. Continue to cook the dough and stirring for about five minutes. The mixture should start to steam. Transfer the dough to your standing mixture. Go ahead and beat for a couple minutes to help release some of the heat from the dough. Next, add in an egg one at a time. I beat the egg prior to adding to the mixture. Stir well after each addition. Fold in the cheese and combine well. Put some of the mixture into a piping bag and pie out the mixture in small amounts...1 1/2 inches side and 3/4 inches tall. Bake the puffs for about 15-20 minutes or until nice and golden in color. Remove from oven and cool completely. Enjoy.