Preheat oven to 175°C. Place bread in a round, buttered, deep dish pie plate. In a medium bowl whisk together eggs, milk, sugar, a dash of salt, vanilla, cocoa, and cinnamon . Add chocolate chips. Pour over bread and gently mix. Let sit for 15 minutes, so bread can absorb mixture. Bake for 30 to 40 minutes until firm but not dry.