Preheat the oven

• Preheat the oven to 200 °C (400 °F).

Cut the potatoes into Lego shapes

• Slice the potatoes lengthwise into half-inch slices.
• Use metal skewers to cut about 1/4 inch apart, then turn the potato 90° and cut the same way to make a crosshatch pattern.
• Cut the crosshatched slices into quarters and square off the edges.

Soak in ice water

• Place the potato bites in ice water to remove the starch.

Coat with Cajun butter

• Drain and pat the potatoes dry.
• Slather them generously with the melted Cajun butter.

Roast the potatoes

• Arrange the potatoes on a baking tray and roast for about 30 minutes.

Make the chipotle ranch

• While the potatoes roast, mix the sour cream, mayonnaise, diced chipotle pepper, garlic powder, onion powder, dill and sea salt in a bowl.

Broil for char

• For the last few minutes, switch the oven to broil until the potatoes have a nice char.

Garnish and serve

• Garnish the potatoes with chopped parsley and grated Parmesan.
• Serve with the chipotle ranch.