Preheat the oven to 325°F (165°C). Line a baking sheet with parchment paper.
Make the candied pecans: in a medium bowl, combine 2 tablespoons corn syrup, 1 tablespoon sugar, 1/4 teaspoon salt, and 1/2 teaspoon cayenne pepper. Add 1 cup pecan halves and stir until all pecans are evenly coated. Spread the pecans in a single layer on the prepared baking sheet.
Bake the pecans: place the baking sheet in the preheated oven and bake for 5 minutes. Stir the pecans, return the sheet to the oven, and bake for an additional 10 minutes. Remove from the oven and let the pecans cool completely on the baking sheet.
Make the vinaigrette: in a bowl, whisk together 3 tablespoons raspberry balsamic vinegar, 1 tablespoon lemon juice, and 1 teaspoon honey. Gradually whisk in 1/4 cup canola oil until combined. Season the vinaigrette with kosher salt and freshly ground black pepper to taste. Set aside.
Prepare the salmon: season all sides of the 4 boneless salmon filets with salt, pepper, and 1/4 teaspoon paprika.
Cook the salmon: heat 2 tablespoons extra-virgin olive oil in a large skillet over medium heat until hot. Add the salmon to the skillet and cook without moving for about 4 minutes. Flip the filets and cook about 4 more minutes for medium-rare (adjust time if your filets are thicker or you prefer a different doneness). Transfer salmon to a plate.
Assemble the salads: in a large salad bowl, toss 12 cups mixed salad greens with 1/2 cup dried cranberries, 1/2 small red onion (thinly sliced), and 1/2 cup crumbled feta cheese. Divide the tossed greens among 4 plates.
Finish and serve: top each plated salad with a cooked salmon filet and a sprinkle of candied pecans. Drizzle the vinaigrette over the salads just before serving.