Remove stem and seeds of pasilla chile and toast in dry skillet over medium heat, pressing with spatula and turning until soft and pliable, about 1 minute. Pour 1/2 cup boiling water over chili, cover and soak 10 minutes. Process pasilla chile with soaking liquid in mini food processor or blender; set aside.
Sprinkle snapper with Knorr® Chicken flavor Bouillon. Heat 1 Tbsp. oil in deep 12-in. skillet over medium-high heat and cook snapper, flesh-side-down, until golden, about 3 minutes. Remove snapper from skillet and keep warm.
Heat remaining 1 Tbsp. oil in same skillet and cook onion, red pepper and mushrooms, stirring frequently, until golden, about 5 minutes. Stir in ginger, garlic and chile de arbol and cook 30 seconds. Stir in pasilla chili puree and cook, stirring occasionally, until thickened, about 2 minutes. Stir in water and coconut milk. Bring to a boil over high heat. Reduce heat to low and add snapper. Simmer covered simmer until snapper flakes with a fork, about 5 minutes . Gently whisk in Hellmann's® or Best Foods® Real Mayonnaise.
Serve, if desired, with chopped fresh cilantro and lime wedges.