Season the chicken breast with the thyme, salt and pepper. In a frying pan melt the butter over medium heat until it's foaming. Place the chicken in the center of the pan. Don't move the pan and slightly press the breast with a spatula, for one minute. Now you should carefully spoon out the foaming butter and pour it over the top of the breast. Keep on doing this regularly (every 10-15 seconds) which prevents your chicken breast from drying out and helps to cook through since we cook it only on one side.
Preheat oven to 200 degrees C (400 degrees F). Place the plums in a baking dish and drizzle with the honey and oil. Sprinkle with the herbs and salt. Roast for about 20-30 minutes until soft but not mushy.