Preheat oven to 375 F

Butter souffle dish and sprinkle grana padano inside to cover the whole inside of souffle dish with butter and cheese

Melt butter and add flour and add milk and simmer until thickened and smooth

Add salt and mustard

Transfer to metal bowl and let cool slightly

Whisk egg whites with cream of tartar until stiff peaks

Add egg yolks to bechamel one at a time.

Gently fold 1/3 egg whites and add comte cheese and add the rest of the egg whites

Pour mixture in souffle dish

Bake in oven for 40-45 minutes until nicely browned .

Serve immediately with some crusty bread and good butter