Remove the cinnamon rolls from the cans and layout all the rolls. Cut each cinnamon roll into 4 pieces. Repeat with all the rolls.
Add all the cinnamon roll pieces into a 9x13 casserole dish.
In a bowl, whisk together the eggs, heavy whipping cream, vanilla, and cinnamon until well combined.
Pour the egg mixture over the cinnamon roll pieces.
Bake cinnamon roll casserole at 350°F for 20-25 minutes, or until slightly golden.
Remove from oven and allow to cool for about 5 minutes.
Meanwhile, add both sweet icing cans into a bowl, and heat in the microwave for about 10-15 seconds.
Heat the icing in the microwave for about 5 seconds to melt it little bit. Using a fork or spoon, drizzle the icing over the entire cinnamon roll casserole. Top with powdered sugar if desired.