Ruth’s Chris Mushroom & Gruyère Au Gratin

Ruth’s Chris Mushroom and Gruyère Au Gratin is the kind of indulgent side dish that instantly elevates a meal to steakhouse status. Earthy mushrooms are gently sautéed, bathed in cream, and baked beneath a bubbling blanket of nutty Gruyère cheese until rich, golden, and irresistible.

This dish is all about depth and balance. Browning the mushrooms first concentrates their flavor, while garlic and thyme add subtle aromatic notes. The cream reduces just enough to coat the mushrooms luxuriously without becoming heavy, allowing the cheese to truly shine.

Gruyère is the star here, offering a smooth melt and a savory, slightly sweet nuttiness that pairs beautifully with mushrooms. A touch of Parmesan adds extra complexity, creating that unmistakable steakhouse richness in every bite.

Perfect alongside a filet, roasted chicken, or holiday roast, this mushroom au gratin is elegant, comforting, and guaranteed to impress with very little effort.

Servings and timing:
Servings: 4
Prep time: 10 minutes
Cook time: 25 minutes
Total time: 35 minutes

Ingredients

• 1 lb mushrooms (white or cremini), sliced
• 2 tablespoons butter
• 1 tablespoon olive oil
• 1 clove garlic, minced
• 1 cup heavy cream
• 1/2 teaspoon salt
• 1/4 teaspoon black pepper
• 1/4 teaspoon thyme, optional
• 1 cup Gruyère cheese, freshly grated
• 2 tablespoons Parmesan cheese, optional

Instructions:

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