
I love this casserole because it can be made the night before and baked in the morning. Just make sure to take it out at least an hour before baking so it comes to room temperature before baking.
Preheat the oven to 350℉ and butter a 13" x 9" glass pan.
Open the cans of cinnamon rolls and cut each individual roll into six pieces. Scatter these pieces in the glass pan. Set the icing aside.
In a large bowl, whisk together the eggs and 3/4 cup of eggnog. Pour this mixture over the cinnamon rolls and bake for 30-40 minutes. Bake until the eggs are fully cooked and lightly browned on top.
In a small bowl, whisk together the icing and remaining 3 Tablespoons eggnog. Remove the casserole from the oven and drizzle the eggnog frosting over top. Serve immediately with fresh berries and maple syrup (if desired).