Set your oven to 425°F to heat up.
In a large baking sheet, place the chicken thighs, sweet potatoes, and red onions; drizzle with olive oil and honey.
Sprinkle kosher salt, dried oregano, dried rosemary, chili powder, smoked paprika, granulated garlic, cumin, coriander, allspice, and minced garlic over everything.
Mix well to ensure all ingredients are evenly covered, then spread everything out flat in a single layer.
Put the sheet pan in the oven and roast for 30 to 35 minutes, until chicken reaches 165°F internally and sweet potatoes are soft and browned.
While the chicken cooks, prepare the yogurt sauce by combining lemon zest, lemon juice, and garlic in a mini food processor and pulsing until finely minced.
Add Greek yogurt, olive oil, dried dill, and salt to the processor; blend until completely smooth.
Serve the roasted chicken and vegetables alongside the zesty yogurt sauce for dipping.