Preheat the oven to 220C, fan-forced. Line a large oven tray with baking paper. Remove 20g butter from the fridge to soften. Cut the potatoes and zucchini into 1.5cm-thick rounds. Crush or finely chop the garlic.
Step 2 — Roast vegetables
Put the potato and zucchini on the lined tray. Drizzle with 1 tbs olive oil, season with salt and pepper and toss to coat. Roast for 15 mins.
Step 3 — Make tomato butter
While the vegetables are roasting, put the softened butter, garlic, umami seasoning and tomato paste in a bowl, season with salt and pepper and stir to combine.
Step 4 — Add chicken
After 15 mins, push the vegetables towards the edges of the tray, then add the chicken. Evenly spread the tomato butter over the chicken.
Step 5 — Roast chicken
Roast the chicken and vegetables for a further 12-15 mins until the chicken is cooked through and the vegetables are tender.
Step 6 — Toss salad and serve
Meanwhile, combine the salad leaves and maple and mustard dressing in a bowl and season with salt and pepper. Serve the roast chicken and vegetables and salad at the table for everyone to help themselves.