Prepare the oven and pan

• Preheat the oven to 180 °C.
• Line a square baking dish with baking paper.

Mix the wet ingredients

• Whisk the melted butter with the sugar until smooth.
• Beat in the eggs, then add the lemon juice and lemon zest.

Add the dry ingredients

• Fold in the gluten-free flour and salt until just combined.
• Pour the batter into the prepared dish and spread evenly.

Bake the brownies

• Bake until the edges are set and the centre is still slightly fudgy.
• Let cool completely in the dish.

Make the lemon glaze

• Whisk the powdered sugar with the lemon juice until smooth.
• Spread the glaze over the cooled brownies and let set before cutting into squares.