Step 1

Preheat oven to 185°C. Grease a 20cm square cake tin and line with baking paper, leaving a little overhanging.

Step 2

For shortbread base, beat butter and sugar in an electric mixer fitted with the paddle attachment until pale and creamy (2-3 minutes). Add egg yolk and beat to combine. Fold in miso, then flour, cornflour, baking powder and ½ tsp sea salt flakes. Press into base of tin with a slightly wet offset palette knife or a spatula. Bake until golden brown (16-18 minutes).

Step 3

Meanwhile, combine sugar, honey, butter and chipotle in a small saucepan over medium-high heat and bring to a simmer, whisking continuously. Add peanuts and ½ tsp salt flakes and stir to coat. Spread peanut mixture over warm shortbread, return to oven and bake until golden brown (15-17 minutes). Cool until only slightly warm.

Step 4

Remove from tin, trim ends and cool completely. Cut in half, then into 3cm-wide bars and serve at room temperature or chilled for a chewier result. Store bars refrigerated in an airtight container for a week.