Make the Batter Base: Whisk the egg in a large bowl until smooth. Whisk in about 3/4 cup of the buttermilk until combined.
Stir in Flour and Corn Mix: Add the flour and stir just until you have a thick batter. Fold in the deli roasted corn & poblano salad until evenly mixed.
Heat and Oil the Griddle: Heat a griddle or large skillet over medium heat. Add about 1 tablespoon canola oil and spread it around the surface.
Cook the Griddlecakes: Spoon batter onto the hot surface to make small cakes about 3 inches wide. Cook until bubbles form and the bottoms are golden, about 3 to 4 minutes, then flip and cook 2 to 3 minutes more until set. Transfer to a parchment-lined baking sheet to keep warm.
Season the Salmon: Pat the salmon dry. Sprinkle both sides with the salt, black pepper, and about 2 teaspoons of the chili powder.
Sear the Salmon: Heat a large nonstick skillet over medium-high heat and add the remaining 1 tablespoon canola oil. Cook the salmon until browned and it flakes easily, about 3 to 4 minutes per side, adjusting time for thickness.
Whisk the Creamy Chili Sauce: In a small bowl, whisk together the Greek yogurt, the remaining 1/4 cup buttermilk, and the remaining 1 teaspoon chili powder until smooth and pourable.
Finish and Serve: Plate the warm corn griddlecakes and top with the salmon. Spoon the creamy chili sauce over the fish and finish with chopped chives.