– 2 cups (240 g) all purpose flour – ½ tsp baking soda – ½ tsp salt – ½ cup (113 g) unsalted butter, melted and cooled – 1 cup (200 g) light brown sugar – ¼ cup (50 g) granulated sugar – ¼ cup (12 g) instant espresso powder or instant coffee powder – 1 large egg (US), room temperature – 1 large egg yolk (US), room temperature – 2 tsp (10 ml) vanilla extract – 1 cup (140 g, 6oz.) dark chocolate, evenly chopped – 2 tbsp flaky salt for topping optional
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