Preheat oven to 425°F.
Season chicken thighs with paprika, chili powder, garlic powder, salt, and pepper.
Heat oil in a large oven-safe pan over high heat. Sear chicken on both sides until browned. Remove and set aside.
In the same pan, sauté zucchini, squash, sweet potatoes, and onion. Season lightly with salt and pepper.
Place chicken back on top of the vegetables, skin side up, and transfer to the oven. Roast for 40–45 minutes, until chicken is cooked through and vegetables are tender.
Remove chicken from the pan and set aside.
Stir in tomato sauce, garlic, garam masala, and ginger. Simmer briefly, then fold in Greek yogurt. Taste and adjust seasoning.
Serve chicken over the vegetables with sauce spooned over top. Great with rice if desired.
