Combine ginger, garlic, fresh chili, yogurt, salt, spices and sugar in a bowl. Add chicken pieces and toss to coat evenly. Let marinate for 15 minutes or up to a day in the fridge.
Heat your oven to 425°F.
Line a half-sheet (13×18-inch) with foil and coat it with 1 T of olive oil or use parchment paper.
Add potatoes, cauliflower, salt, cumin and remaining 2 tablespoons olive oil and toss together until evenly coated. I like garlic so I added a minced glove of garlic as I was tossing the vegetables.
Remove chicken from marinade and leave excess behind.
Nestle the chicken pieces among the vegetables throughout the pan.
Roast in oven for 20 minutes, then toss the potato and cauliflower to ensure they’re cooking evenly
Return the pan to the oven for 10 to 20 minutes more (i.e. 30 to 40 minutes total roasting time) until chicken and vegetables are cooked through.
If necessary remove chicken from pan and turn broiler on to crisp the potatoes and cauliflower
While it roasts, if you’d like to use the lightly pickled onion rings that we did on top, which added a nice tangy fresh zip to the dish, separate the rings and toss them in a small bowl with a squeeze of lemon juice and a pinch of salt. Set aside until needed.
When chicken and vegetables are cooked, top with garnishes of your choice.
I used thinly sliced red onions, cilantro, mint and diced scallions to garnish.