• Preheat your oven to 375°F (190°C).
• Grease a 9×13-inch baking dish with cooking spray or butter.
• Open the cans of refrigerated cinnamon rolls and set aside the icing.
• Cut each cinnamon roll into quarters.

Assemble

• In a large bowl, whisk together the eggs, milk, vanilla extract, and ground cinnamon.
• Add the cinnamon roll pieces to the bowl and gently toss until they are coated in the egg mixture.
• Pour the mixture into the prepared baking dish, spreading it out evenly.
• Place the baking dish in the preheated oven and bake for 25-30 minutes, or until the casserole is golden brown and set in the centre.

Prepare the icing

• While the casserole is baking, prepare the icing by whisking together the powdered sugar, milk, and vanilla extract in a small bowl.

Serve and enjoy

• Once the casserole is done baking, remove it from the oven and let it cool for a few minutes.
• Drizzle the icing over the top of the casserole.
• Slice into squares and serve warm.