Heat the oven to 425°F (220°C).
Place all the glaze ingredients into a medium bowl, and whisk together until well combined. Set aside. Season the chicken thighs with salt and pepper.
Arrange the squash, fennel and grapes on a baking tray, and toss with half of the glaze. Place the chicken thighs on top of the vegetables and brush with the remaining glaze.
Place the tray in the preheated oven and bake for 20 minutes, removing the tray from the oven and rotating it. Now return the tray to the oven to cook for a further 15-20 minutes until the squash and fennel are golden brown, and chicken is cooked through.
Remove from the oven and serve immediately.
