In a large bowl stir together the salmon, scallion, and parsley. In a separate bowl combine the mustard and mayonnaise and season with salt & pepper. Add the mayonnaise mixture to the salmon mixture and gently stir together. Add to up to 1/2 cup of the breadcrumbs to help bind everything together. Shape into 4-6 cakes, depending on desired size, and chill for 1 hour. Dip cakes into remaining bread crumbs. Heat oil in non-stick skillet and cook cakes on each side until golden brown. Serve over mixed greens with lemon vinaigrette.
LEMON VINAIGRETTE DRESSING
Combine all ingredients in a small jar, cover and shake until well combined.
Stir all ingredients until well combined and chill.