– 1 c (125g) all purpose flour sub 1:1 with GF flour blend (see notes) – ½ tsp baking soda – ½ tsp salt – ½ c (113g) unsalted butter, room temperature sub with salted butter and omit the added salt – ½ c (100g) light brown sugar – 2 tbsp (25g) granulated sugar – 1 (57g) large egg, room temperature – 1 (17g) large egg yolk, room temperature – 1 tsp vanilla extract or vanilla bean paste – 1-2 tbsp (15-30ml) bourbon – 1.5 - 2 oz (~ 40-45g) toffee bar, chopped into small pieces about ¼" – 4 oz (113g) milk, bitter or semi sweet chocolate bar, chopped into small pieces about ¼" – flaky salt for topping
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