In a large pot, melt 2 tablespoons of butter over medium heat. Once melted, add 1 diced onion and 2 minced garlic cloves. Cook this mixture for about 5 minutes, stirring frequently until the onion is translucent and fragrant.

Pour in 4 cups of seafood or chicken broth, stirring gently to combine. Season with 1 teaspoon of dried thyme, 1 bay leaf, and a pinch of salt and pepper to taste. Bring the mixture to a simmer over medium heat, letting it bubble gently for about 10 minutes.

Carefully stir in 1 pound of large, peeled shrimp and 1 cup of crab meat into your simmering broth. Cook for an additional 5 minutes, or until the shrimp turn opaque and pink.

Reduce the heat to low and slowly drizzle in 1 cup of heavy cream, stirring continuously. Allow the bisque to warm gently for about 3-4 minutes without boiling.

Taste your luxurious bisque and adjust the seasoning as needed, removing the bay leaf before serving. Let it sit for a minute while the flavors settle in.

Ladle the bisque into warm bowls and garnish with freshly chopped parsley or chives. Serve with crusty baguette slices or a glass of white wine.