Place the halved radishes in a large mixing bowl with olive oil, garlic powder, onion powder, salt, and pepper. Mix with a spoon until the radishes are coated.
400 g Radishes, 1 tablespoon Olive Oil, ½ teaspoon Salt, ¼ teaspoon Garlic Powder, ¼ teaspoon Onion Powder, ⅛ teaspoon Black Pepper