Preheat the oven to 190C/375F. Prick the potatoes all over with a fork or the end of a sharp knife.
Microwave them for about 5 or more minutes, until cooked through. You could bake them but be fore-warned that that could take an hour.
Put the pre-cooked potatoes on a baking sheet and press on each potato with a potato masher or the bottom of a jar or some other flat surface, so that the potatoes mostly flatten.
Drizzle with olive oil. Season with salt, pepper, fennel seeds and chili flakes.
Pop the pan in the oven and bake for about 30-45 minutes. You might want to start checking at 15 minutes or use your nose to determine if they're ready to come out. They're done when they are a bit browned, the oil has been absorbed and the spices are toasted but not burnt.