Heat 2 tablespoons olive oil in a skillet over medium heat. Add the garlic and cook until it softens slightly, about 1 minute. Add the brandy and swirl the pan until the alcohol evaporates. Add the wine and 1/4 cup water and cook to reduce slightly, 3 to 4 minutes. Stir in the parsley, 1/2 teaspoon salt, and pepper to taste. Transfer the mixture to a blender with 2 tablespoons olive oil and puree until smooth. Cover and set aside.
When ready to serve, heat the remaining 2 tablespoons olive oil in a skillet over high heat. Add the shrimp; cook until just pink, 1 to 2 minutes. Add the green sauce, season with salt and pepper, and warm through. Drizzle with olive oil or water to loosen the sauce. Serve with bread.