Put baby potatoes into a pot and add cold water just enough to cover. Bring water to a full boil then leave to simmer over low heat until they are just cooked. Use a fork to test. It should be able to poke through with some resistance. Do not overcook ( It took me about 5 minutes to simmer).
Heat oil in a large frying pan. Add drained potatoes. Use a glass to press each one to create some cracks (but do not mash them).
Fry over medium heat until the first side becomes golden. Flip over to brown on the other side.
Sprinkle the mixture of chili flakes, five spice (or ground Sichuan pepper, cumin powder) and salt. Garnish with scallions and serve immediately.