What Do We Need?
Butter, room temperature, for greasing the souffle
2 tablespoons grated Parmesan
6 ounces sharp Cheddar
1 1/2 ounces (3 tablespoons) butter
3 tablespoons flour
1 teaspoon dry mustard
1/2 teaspoon garlic powder
1/8 teaspoon kosher salt
1 1/3 cups milk, hot
4 large egg yolks (2 1/2 ounces by weight)
5 egg whites plus 1 tablespoon water (5 1/2 ounces by weight, plus 1/2 ounce water)
1/2 teaspoon cream of tartar
How Do We Make It?
Use room temperature butter to grease an 8-inch souffle mold. Add the grated Parmesan and roll around the mold to cover the sides. Cover with plastic wrap and place into the freezer for 5 minutes.
Preheat oven to 375 degrees F. In a small saucepan, heat the butter. Allow all of the water to cook out.
In a separate bowl, combine the flour, dry mustard, garlic powder, and kosher salt. Whisk this mixture into the melted butter. Cook for 2 minutes. Whisk in the hot milk and turn the heat to high. Once the mixture reaches a boil, remove from the heat.
In a different bowl, beat the egg yolks to a creamy consistency. Temper the yolks into the milk mixture, constantly whisking. Remove from the heat and add the cheese. Whisk until incorporated.
In a new bowl, using a hand mixer, whip the egg whites and cream of tartar until glossy and firm. Add 1/4 of the mixture to the base. Continue to add the whites by thirds, folding very gently. Pour the mixture into the souffle. Fill the souffle to 1/2-inch from the top. Place on an aluminum pie pan. Bake in the oven for 35 minutes.