Preheat oven to 375° and butter a 9x13 baking dish.
Butter
Cut each cinnamon roll into nine pieces, place all cinnamon roll pieces into a buttered baking dish, and set the icing canisters aside for later use.
24.8 oz cinnamon rolls
In a medium-sized bowl, whisk together eggs, milk, cinnamon, and vanilla.
6 eggs, ½ cup milk, 1 tbs cinnamon, 1 teaspoon vanilla
Pour egg mixture over cinnamon roll pieces. Then pour maple syrup over the cinnamon rolls. Sprinkle with brown sugar.
½ cup maple syrup, ¼ cup brown sugar
Bake for 40-50 minutes, or until it is baked all the way through. If the top of the cinnamon roll French toast is getting too dark (might happen around the 35-40 minute mark), you can put a piece of foil over the entire dish and then continue baking until done.
Once finished baking, spread the cinnamon roll icing over the top.
Notes
Tips and Tricks
Leftovers: Store leftovers in an airtight container in the refrigerator for up to 4 days.
Reheat: Microwave for 20-30 seconds, check, then repeat until warmed through. Alternatively, if you are reheating a large portion, you can heat it in the oven at 350°F until warmed through, but the frosting might melt and disappear into the cinnamon rolls.