Heat a 12-inch skillet over high heat. When the pan is hot, add 1 tablespoon olive oil and 2 tablespoons butter. When the butter has melted, add the mushrooms in an even layer and cook, stirring occasionally, until the mushrooms are golden brown and tender and the mushroom liquid (if any) has evaporated, 5 to 8 minutes. Season to taste with salt and transfer to a plate. (The recipe may be prepared to this point up to 8 hours ahead.)
Set the skillet over medium-high heat and add remaining 1 tablespoon olive oil and 1 tablespoon butter. When butter has melted, add the shallot, season with a pinch of salt and cook, stirring occasionally, until tender and golden, 3 to 4 minutes. Add the wine and cook until reduced by half, about 1 minute.
Return mushrooms to the pan and add Brussels sprouts and cream. Stir in a few grinds of pepper and continue to cook, stirring occasionally, until the cream thickens and coats vegetables, 3 to 4 minutes. Season to taste with salt and pepper. Serve immediately or keep warm, covered, in a 200-degree oven for up to 30 minutes.
Nutrition information per serving:
Calories340Fat30 gSodium42 mg
Carbohydrates15 gSaturated fat13 gCalcium80 mg