4 eggs (whites and yolks separated) 1/4 cup butter (half stick) 1/4 cup flour 1 cup milk, warmed (in microwave) but not hot 1/2 teaspoon salt (or to taste) 1 teaspoon Dijon mustard 1/2 cup grated Cheddar cheese 3 ounces Feta cheese (regular or with sun-dried tomatoes or basil), finely diced (you may as well purchase diced feta) 2 ounces grated Parmesan cheese, divided in half
DIRECTIONS:
Pre-heat oven to 375 degrees F. Generously spray large souffle dish.
Sprinkle all over bottom and sides of souffle dish with half of Parmesan cheese. Set aside.
Carefully separate egg yolks and whites into 2 different bowls. Be especially careful not to accidentally get any egg yolk into whites! If you accidentally get a drop of a broken yolk into whites, carefully remove it with spoon.
With wire whisk, beat yolks until smooth.
With electric mixer, beat egg whites until thick and foamy. Be careful not to overbeat! Stop your mixer as soon as soft peaks form.
Cut butter into several chunks.
Melt butter in large skillet over medium heat.
Add flour.
Immediately start whisking flour with wire whisk. Whisk constantly just until flour mixture begins to turn a light brown in color.
When well-blended, add milk.
Whisk until smooth.
Cook over low heat for 2 to 3 minutes until thick and creamy.
Stir a spoonful of flour mixture into egg yolks.
Mix well with wire whisk.
Pour all egg yolk mixture into flour mixture.
Whisk until smooth.
Add salt.
Add mustard. Mix well.
Add Cheddar cheese.
Mix well.
Add a spoonful of egg whites into cheese sauce.
Carefully fold egg whites into cheese sauce. Do not overmix! Fold just several times. It is okay to see bits of white.
Add remaining egg whites and fold gently until the mixtures are just combined, cutting down through center to bottom and moving along the side of bowl, up and down. Do not overmix! Having some bits of whites is perfectly okay.
Add feta cheese. CLICK HERE for instructions.
Carefully fold in. Do not overmix!
Gently spoon souffle mixture into dish.
Sprinkle with remaining Parmesan cheese. Bake in preheated oven for 25 to 30 minutes or until puffed and golden brown.