Preheat oven to 400°F/200°C. Brush a baking dish or rimmed tray with olive oil.*
Add radishes to prepared baking dish, drizzle with olive oil and season with salt and freshly ground black pepper to taste. Roast for 45-60 minutes, until golden and lightly crisp, tossing them about half way through.
Now you can either just add some butter and top them with cheddar cheese right there. Or pile them up in a ramekin with a touch of butter between the layers (our preferred way!).
Set your oven to broil, and cook your cheddar-topped radishes until the cheese is fully melted.
Serve right away topped with sour cream, crumbled crispy bacon and chives or bring onions.
*Based on your feedback, some of you are roasting them at 450°F/230°C for 45-60 minutes. So you will need to do some fiddling around depending on the size of your radishes and oven. So we suggest you taste them a bit along the way and adjust accordingly. Just note that we do prefer to roast them for longer at a lower temperature for optimal results. Please note that nutrition facts are estimated for a 50g serving of (trimmed) raw radishes and the amounts stated in the recipe. But feel free to fiddle around with the toppings to suit your taste buds.