Marinate the chicken thighs in olive oil, lime juice, garlic powder, cumin, and chili powder.

Grill the marinated chicken until cooked through, then slice into strips.

Warm the corn tortillas on the grill or in a skillet.

Assemble the tacos by placing grilled chicken on each tortilla, then topping with fresh cilantro, diced onion, sliced radishes, and sour cream or Greek yogurt.

Add hot sauce to taste before serving.