Heat a small skillet over medium heat. Add 1/2 tsp olive oil and 1/2 tsp honey to the pan. Tilt to coat. Add walnuts to pan with 1/8 tsp cinnamon and a pinch of salt. Cook for 3-4 minutes to toast, stirring often.
Prepare your dressing by peeling and slicing one plum and toss into a blender cup.
Add 2 tbsp olive oil, 2 tbsp apple cider vinegar, 1 tbsp dijon mustard, 2 tsp honey, 1/4 tsp dried thyme, and some salt and pepper to taste (about 1/8 tsp each). Blend until smooth.
Prepare your salad base by washing and drying 4 cups of dark leafy greens. Add to your serving bowl.
Wash and slice 1-2 plums, depending on how many you'd like in the salad. Throw the plum slices on top of the greens.