This section is from the book "Studies of American Fungi: Mushrooms, Edible, Poisonous, Etc.", by George Francis Atkinson. Also available from Amazon: Studies of American Fungi: Mushrooms, Edible, Poisonous, Etc..
As these varieties usually grow together and are sort of companion mushrooms, recipes given for one will answer for the cooking of the other. Being soft and juicy, they must be handled with care, and are much better cooked with dry heat. Remove the stems, and wash them carefully; throw them into a colander until dry; arrange them in a baking pan; dot here and there with bits of butter, allowing a tablespoonful to each half pound of mushrooms; dust with salt and pepper, run them into a very hot oven, and bake for thirty minutes; dish in a heated vegetable dish, pouring over the sauce from the pan.
The C. micaceus may also be cooked after the same fashion - after dishing the mushrooms boil down the liquor.
Wash and dry them; put them into a large, flat pan, allowing a tablespoonful of butter to each half pound of mushrooms; sprinkle at once with salt and pepper; cover the pan, and stew for fifteen minutes. Moisten a tablespoonful of flour in a little cold milk; when smooth, add a half cup of cream, if you have it; if not, a half cup of milk. Push the mushrooms to one side; turn in this mixture, and stir until boiling. Do not stir the mushrooms or they will fall apart and become unsightly. Dish them; pour over the sauce, and serve at once. Or they may be served on toast, the dish garnished with triangular pieces of toast.