Combine sugar and cinnamon and set aside. Melt butter over medium heat in a large skillet. Add pecans and stir constantly until pecans are lightly toasted, about 5 minutes.
Remove from heat and immediately add cinnamon sugar mixture. Stir well to mix. Pour onto a foil lined tray. Cool completely. Chill until ready to serve.
Combine raspberries, water, vinegar, corn syrup and ground mustard in a blender or food processor. Blend until smooth. Gradually add oil. Stir in chives and season with pepper and salt. Chill until ready to serve.
Combine salad greens with feta cheese. Top with fresh raspberries, if desired. Drizzle with Raspberry Vinaigrette and top with Cinnamon Dusted Pecans.