Preheat your oven to 350°F (175°C) and grease a 9x13-inch baking dish.

Slice the cinnamon rolls into quarters and arrange in the prepared baking dish.

In a large bowl, whisk together eggs, whole milk, heavy cream, granulated sugar, vanilla extract, ground cinnamon, and salt until smooth.

Pour the custard mixture over the cinnamon roll pieces and gently press down to coat.

Sprinkle optional ingredients like raisins or chopped nuts over the top.

Let the mixture soak for 10-15 minutes.

Bake in the preheated oven for 45-50 minutes until golden brown.

Remove from oven, cool for 15 minutes, and optionally drizzle with icing before serving.