Prepare grill for medium heat.
Pound chicken breasts to an even thickness.
Brush both sides of chicken breasts with olive oil and season with salt and pepper.
While the grill is heating, prepare the Creamy Citrus Dressing.
Place garlic, lemon juice, orange juice, white wine vinegar, honey, dijon, salt and pepper into a blender. Blend until smooth. With the blender running, slowly stream in olive oil. Add yogurt or sour cream and blend until smooth.
Reserve 1 cup of Creamy Citrus Dressing for salad.
Place chicken on grill, cook for 3 minutes and turn. Start basting the chicken with Creamy Citrus Dressing. Cook for 4 minutes and turn again. Continue to baste chicken as it cooks. Turning one additional time. About 15 minutes or until internal temperature of chicken reaches 165 degrees.
Remove from grill and allow to rest while you prepare the salad plates.
Place spring greens over each plate and top with tomatoes, cucumbers and tomatoes.
Slice Chicken breasts thinly and place over vegetables. Top with Creamy Citrus Dressing.