Chicken and Mushrooms in Orange Sauce

This recipe is in THE OUTLANDISH COMPANION, but I'm in Santa Fe right now and don't have a copy with me, so this is out of my head. It may read a little differently from the printed version, but it should taste the same. [g:]

Chicken breasts (allow one per person) - diced

Garlic, minced

Onion, minced

Mushrooms, sliced or chopped – 2/3 good sized mushrooms per chicken breast.
(Any kind—I like a mixture of the regular ceps (default grocery-store mushrooms), porcini (these usually come dried an...