Preheat the oven to 350°F. Pat the chicken thighs dry using paper towels. Season all over with 1.5 teaspoons kosher salt, rubbing to adhere. Let the thighs rest, skin-side up, on a plate until ready to cook.
Toast the cumin and coriander seeds in a small skillet until aromatic and lightly toasted. Grind them into a powder using a spice grinder or mortar and pestle.
Mix the ground spices with garlic, paprika, pepper, cardamom, cinnamon, and olive oil to form a thick paste. Rub this paste over the chicken thighs.
Cook the chicken in a skillet until golden brown on both sides. Transfer the thighs to a baking sheet, add radishes around them, and roast until the chicken is cooked through and the radishes are crispy.
Serve the chicken thighs and radishes with yogurt, hot sauce, and a side salad or rice.
