Preheat oven to 300°F (150°C). Line a 13 x 9 in. (3 L) baking pan with parchment paper. Press cookie dough into the bottom of the pan and bake for 10 min. Remove from oven and reduce temperature to 275°F (140°C).
Meanwhile, heat butter, cream and liqueur in a small saucepan. Remove from heat, add chocolate chips and stir until smooth. In a mixing bowl, whisk eggs and sugar until pale yellow. Temper the eggs by adding a bit of the chocolate mixture to the egg mixture. Slowly add the rest of the chocolate mixture into eggs and stir until well blended.
Pour chocolate mixture over the cookie base and bake until chocolate has set, about 45 min. Remove from oven, let cool completely and refrigerate overnight. Use parchment paper to lift the squares out of the pan and cut into 60 pieces with a hot knife. Store in an airtight container in the fridge up to 1 week.
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