Caryo, here's the way I cook grouse, when in camp (and either I or my buds kill a few). This is for four, half breasts.
1. Fillet the breasts off the bones.
2. Put some flour, salt and pepper, and a 1/4 Teaspoon Powdered Thyme, in a paper sack, or on a plate, whatever.
3. Dredge breasts in flour mixture and coat lightly.
4. Heat 1/4 cup good Olive Oil in a cast iron skillet. When pretty hot, put two tablespoons butter in the oil. Let melt and then put in the breasts.
5. Watch your heat. Don't burn the grouse, but cook rather quickly. (I just eyeball it, but I've been doing it a long tome.)
6. When done, take breasts out and set aside.
Drain off most oil, but leave the fond. Then throw in some finely chopped onions, about 1/2 cup, a minced clove or two of garlic, and soften.
7. Deglaze with good red wine.
8. Put breasts back in, heat for awhile, then plate up. Pour the "gravy" over the breasts.
Good eats!
L.W.