Combine the ingredients for the pudding in a large bowl. Whisk to mix. Pour the mixture over the bread, and stir to combine. Allow the mixture to sit for an hour.
Transfer the bread mixture to a 9x13 inch buttered casserole dish and bake at 350 until the center of the bread pudding is set, 50 to 60 minutes.
Top with the glaze and sprinkle with purple, yellow and green crystals.
Recipe by Kitchen Belleicious at https://kitchenbelleicious.com/2015/01/29/king-cake-bread-pudding/