I just consulted with my chef boyfriend, and he's wondering if you put hot milk into the roux? Cold milk would cause the problem you describe.
The cheeses shouldn't make a difference. He also suggested sauteeing the mushrooms separately and adding them at the end, before baking.



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It's part of his birth cultural cooking DNA. (German). He doesn't do it often and we rarely buy butter for home cooking. It tends to be for special occasion meals at home and it is lovely with the right type of entrees. Or any butter based sauce.

