Steak with Potato Gratin

Ingredients

• 5 garlic cloves, divided
• 1 tablespoon unsalted butter, softened
• 2 1/2 cups heavy cream
• 2 shallots, quartered
• 1 tablespoon kosher salt
• 1 teaspoon freshly ground black pepper
• 1 tablespoon thyme leaves
• 1 tablespoon rosemary
• 4-5 pounds russet potatoes, scrubbed, sliced very thin on a mandolin
• 1 cup Gruyere cheese
• 1 cup Parmesan cheese
• Four 6-8 ounce filets
• Generous amount Kosher salt and black pepper
• 6 tablespoons butter
• 3 tablespoons olive oil
• 4 sprigs of rosemary
• 5 sprigs of thyme
• 6 sage leaves
• 6 cloves of garlic