Cook the spaghetti

• Bring a large pot of salted water to a boil.
• Cook the spaghetti until al dente, then drain, keeping a little cooking water.

Make the garlic sauce

• Warm the olive oil and butter in a pan over low heat.
• Add the sliced garlic and chili flakes and cook gently until the garlic is golden and fragrant, without browning.

Combine and serve

• Add the drained spaghetti to the pan with a splash of cooking water and toss to coat.
• Stir in the grated parmesan and chopped parsley, then serve immediately.