Preheat oven to 375 degrees. Drizzle mushrooms with a little olive oil, then sprinkle with salt and pepper. Roast for 20 to 25 minutes, or until golden brown. Set aside.

In a large pot, heat additional olive oil along with the butter over medium heat. Throw in the sliced onions and saute for a couple of minutes, or until beginning to turn translucent.

Pour in wine and whiskey and allow to bubble for a minute or two. Pour in broth and allow the liquid to reduce for a couple of minutes. Stir in cream and reduce heat to low. Add mushrooms, salt, and pepper, and simmer until sauce thickens.

Toss in cooked pasta, using a little hot pasta water if sauce needs a little thinning. Taste for seasonings and add immediately.