Add the sliced potatoes, shallots, carrots, sprouts and parsnips.
Drizzle with more oil, and sprinkle on sage and a good pinch of salt and pepper.
Toss so that all the veg is coated in oil.
Roast for 20 minutes.
Remove from the oven, give it a good mix, rub the turkey steaks with a little oil, and season with a little salt and pepper.
Return to the oven for 20-25 minutes until the turkey is thoroughly cooked and the potatoes are soft.
Notes
Potatoes like Maris Piper are fine, I use “baking potatoes” from the supermarket.
I leave the skin on my potatoes, but you can peel them if you prefer.
If you are using large turkey breasts, they may need to roast for longer, check the package instructions and adjust bake time accordingly, even if this means putting your turkey in at the same time as your vegetables.