Pre-heat oven to 170℃ fan/350F, 190℃/375 or Gas Mark 5.
Butter the base of a baking dish with the butter.
Chop the panettone into small cubes (about 3cm). Put into a buttered baking dish.
Mix the cream, milk, eggs, Baileys and sugar together and pour over the panettone. Sprinkle over the chocolate chips. Allow to soak in well for at least 30 minutes (see notes below).
Bake in the preheated oven for 30-40 minutes until the egg mixture is just set and the top is golden and crispy.
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