Spray or coat a baking sheet with a little olive oil and place the chicken thighs on the sheet. In a small bowl, combine the thyme, red pepper flakes, garlic, ¾ of a teaspoon of the salt and ¼ teaspoon of the black pepper. Brush the chicken with 1 ½ tablespoons of the oil and sprinkle with the garlic spice mixture, rubbing it in a bit. Place the halved orange on the baking sheet, cut side down.
Roast the chicken until it reaches 165°F about 35-40 minutes.
Meanwhile, place the green beans and mushrooms on a baking sheet. Drizzle with the remaining olive oil, salt and pepper and toss to combine. Roast about 15 minutes, stirring once halfway through.
Divide the chicken and vegetables between plates and squeeze the roasted orange halves over the top.
Notes
You could use a lemon in place of the orange. If using boneless, skinless chicken breasts - roast them for about 25-30 minutes.