Step 1

Place potato, garlic, milk and cream in a large saucepan (see note) over medium heat. Bring to a simmer (do not boil). Reduce heat to low. Cover. Simmer gently for 15 minutes. Remove lid. Simmer for a further 5 to 7 minutes or until potatoes are tender. Remove from heat.

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Step 2

Using a ladle, remove and discard 1/3 cup of the milk mixture. Add butter to the potato mixture. Mash until smooth. Season well with salt and pepper.

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Step 3

Serve mash drizzled with oil and sprinkled with thyme leaves.