Bring 4 cups water with the salt to a boil in a medium saucepan over high heat. Slowly stir in the grits, then reduce the heat to low; stir constantly to make sure the grits don't stick to the bottom. Simmer until all the water has been absorbed, about 20 minutes. Stir in the butter and mascarpone or cream cheese. Remove the grits from the heat and place a piece of plastic wrap on the surface to keep a crust from forming.
For the shrimp, heat the olive oil in a large skillet over moderate heat. Season the shrimp with Creole Spices and salt and sauté them in batches until they begin to brown but are not yet cooked all the way through; set aside.
In the same skillet, sauté the andouille or smoked sausage, garlic, onion, peppers, and thyme until they become aromatic, about 5 minutes. Add the Shrimp Stock and bring to a simmer. Stir in the butter and heavy cream and simmer until the sauce has thickened, 3–5 minutes.
Return the shrimp to the skillet and cook for an additional 5 minutes. Add the lemon juice and chives or just the green ends of the green onions thinly sliced. .
Divide the grits among the bowls. Arrange the shrimp in each bowl, spoon sauce around them, and garnish with sliced green onions. Enjoy!