Unseal the packaged cinnamon rolls and slice each individual roll into four equal segments. Set the chopped pieces aside for later use.
In a medium-sized mixing bowl, thoroughly blend the eggs, milk, vanilla, and cinnamon using a whisk until the mixture is smooth and uniform.
Transfer the cinnamon roll quarters into the custard mixture and gently toss to ensure every piece is evenly coated.
Place a large skillet or flat griddle over medium heat. Add butter and allow it to melt completely, spreading it across the surface.
Arrange the soaked cinnamon roll cubes in the pan, ensuring they are not overcrowded. Work in multiple rounds if required.
Fry each piece for approximately 2 to 3 minutes per side, turning once they are browned and cooked throughout.
Once done, plate the French toast cubes and enhance with your preferred toppings—whether it be the provided icing packet, a dusting of powdered sugar, or a drizzle of maple syrup.
Serve immediately while warm.