- Step 1
Preheat the oven to 240C. Line a baking tray with baking paper.
- Step 2
Place the potatoes in a large saucepan of salted water and bring to the boil over high heat. Boil for 15 minutes or until the potatoes are tender. Drain well.
- Step 3
Arrange potatoes on the lined baking tray. Using a potato masher, smash each potato so that it’s flattened but still holds together. Brush with the olive oil and season well with salt and pepper.
- Step 4
Bake the potatoes for 25 minutes or until crisp and golden. Cool slightly.
- Step 5
Meanwhile, mix garlic, parsley, thyme, basil and cheese together in a bowl. Place a spoonful of the herbed cheese on each potato, then finish with a slice of prosciutto piled on top. Serve the potatoes garnished with watercress.