Preheat the oven to 375 degrees F.
In a medium bowl, combine the bechamel with the Gruyere and Parmesan. Stir well to combine and set aside.
Set a 12-inch saute pan over medium heat and add 2 tablespoons of whole butter. Once the butter is melted, add the shallots to the pan and cook until soft, about 1 minute. Add the crabmeat and season with the salt and pepper. Cook the crabmeat in the saute pan and toss to evenly mix, about 2 minutes. Add the chives, parsley and tarragon to the crab and continue to toss to blend.
Pour the sauce over the crabmeat and stir to combine. Transfer the crabmeat mixture to a 1-quart oval casserole dish. In a medium bowl, combine the bread crumbs with the melted butter and Essence and stir to blend. Sprinkle the bread crumbs over the crabmeat and place the casserole in the oven until well browned and bubbly, about 15 to 20 minutes.
Remove from the oven, garnish with chopped parsley and serve with toast points.
Yield: 6 to 8 servings