Spicy harissa chicken thighs roasted on one tray with cauliflower, chickpeas and red onion, finished with a cool lemon yogurt. Spread the tray out so the cauliflower roasts and browns rather than steams.

A serving has about 43g of protein, 7g of fibre and 427 calories. The protein comes from the chicken, the chickpeas and the yogurt. These figures are for the traybake and yogurt only; add flatbread or couscous if you want more carbohydrate, and the numbers rise accordingly.
Why thighs rather than breasts. Skinless chicken thighs have a little more fat than breast, which keeps them juicy in a hot oven and makes them much harder to overcook. With the skin removed, they are still a lean protein.
Cauliflower is the bulk of the tray. Roasting it at a high heat browns the edges and gives it a nutty flavour, so a large amount feels like a proper part of the meal rather than a side. Cauliflower is a cruciferous vegetable, from the same family as broccoli and kale.
Why it is tagged for blood sugar. With about 22g of carbohydrate a serving, mostly from the chickpeas and onion, and plenty of protein and fibre, this is a dinner that should not push blood sugar up sharply.
About harissa. It is a North African chilli paste, and brands vary a lot in heat and salt. Check the label if you need it to be gluten-free, as most are but a few are not. For another one-tray chicken dinner, see the Greek lemon chicken traybake.