Preheat your oven to 400°F (200°C) and season the cubed sweet potatoes with olive oil, salt, and pepper. Spread them evenly on a sheet pan for a perfect roast.

While the sweet potatoes are ready, season your boneless chicken thighs with your favorite spices, such as garlic powder, paprika, and a sprinkle of salt. Place them on the sheet pan alongside the sweet potatoes.

Roast everything in the oven for about 30 minutes, or until the chicken is cooked through and the sweet potatoes are fork-tender.

In a bowl, combine the Greek yogurt and grated cucumber. Add a pinch of salt, a splash of lemon juice, and stir until well blended.

Once everything is out of the oven, plate your chicken and sweet potatoes, and generously drizzle the tzatziki sauce on top.