Whisk ingredients together until well blended. Set aside.
Rinse duck breasts with cold water and pat dry.
Coat breasts with olive oil, rub both sides well with Brown Dog Riba-Riba Rub and place in a baking dish sprayed with cooking spray.
Roast at 350° until browned, about 40 to 45 minutes.
While breasts are roasting in the oven, rinse greens if needed and divide equally on six plates. Put plates back in refrigerator to keep chilled.
When duck breast is about finished, take out plates with greens and drizzle vinaigrette over the greens.