Preheat oven to 350 degrees.
Coat a 1 1/2-quart souffle dish with cooking spray; sprinkle with 1/3 cup dry breadcrumbs.
Combine potato starch, salt, pepper, and nutmeg in a medium saucepan, and gradually add 1 cup milk, stirring with a whisk.
Bring to a boil over medium heat, stirring constantly with a whisk.
Cook 1 minute or until thick, stirring constantly (mixture will be thick).
Remove from heat; stir in cheese, thyme, and parsley.
Spoon mixture into a large bowl, and let stand 1 minute.
Whisk in egg yolk.
Place egg whites and cream of tartar in a large bowl; beat with a mixer at high speed until stiff peaks form.
Gently stir one-fourth of egg whites into cheese mixture; gently fold in remaining egg whites.
Gently spoon mixture into prepared dish.
Bake at 350 degrees for 35 minutes or until puffed and golden.
Serve immediately.