Combine ingredients in a small bowl and mix well. Set aside.
To make salmon cakes:
Preheat oven to 450°F Coat a baking sheet with cooking spray.
Heat 1 1/2 teaspoons oil in a large nonstick skillet over medium-high heat. Add onion and celery; cook, stirring, until softened, about 3 minutes. Stir in parsley, remove from the heat.
Put salmon in a medium bowl. Flake apart with a fork, remove any bones and skin. Add egg and mustard(and honey if using), mix well. Add onion mixture, breadcrumbs and pepper, mix well. Shape the mixture into 8 patties, about 2 1/2 inches wide.
Heat remaining 1 1/2 teaspoons oil in the skillet over medium heat. Add 4 patties and cook until the bottoms are golden, 2 to 3 minutes. Using a wide spatula, turn them over onto the prepared baking sheet. Repeat with the remaining patties.
Bake the salmon cakes until golden on top and heated through, 15 to 20 minutes. Serve salmon cakes with creamy sauce and lemon wedges.