Salmon Burger with Mustard Cream Sauce

Preheat the oven to 450 degrees F and line a baking sheet with parchment paper.In a large bowl, mix salmon, red onion, red bell pepper, zucchini, ¼ cup dill, paprika, 1 teaspoon garlic powder, eggs, and flour. Divide evenly into fourths and form into 4 burger patties, each about 3/4-inch thick. Place patties on the baking sheet.Bake burger patties for 20 minutes, until golden brown and cooked through.In the meantime, make the yogurt mustard sauce. In a small bowl, combine yogurt, mustard, lemon juice, the remaining tablespoon of dill and the remaining ½ teaspoon garlic powder. Set aside.Once salmon burger patties are cooked, add to toasted burger buns along with sauce, tomato, and arugula.