Boil the potatoes for 15-20 minutes until just cooked. (You can check this by seeing if a small sharp knife goes through them easily but they don’t fall apart.) Then leave them to drain in a colander so the outsides dry out.
Heat the oven to 200℃ fan/220℃/Gas Mark 7/450F.
Use a little of the oil to grease a baking sheet, then mix the rest with the garlic and a good pinch of salt and pepper.
Place the potatoes on the baking sheet and use a potato masher, or even the bottom of a pan or glass, to smash them.
Drizzle over the garlicky oil and bake for 40-50 minutes until very crispy and golden.
Serve while they’re still hot and scatter over a little chopped parsley.
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