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Preheat the oven to 350°F. Spray the bottom and sides of a 9×13-inch pan with nonstick spray.
Open the cinnamon rolls and arrange them in rows in the pan.
Spread the entire can of frosting in an even layer over the rolls. Sprinkle the walnuts (if using) over the frosting.
Sprinkle the larger pouch of cake mix evenly over the frosting, followed by the smaller pouch of cinnamon-brown sugar. Do not mix.
Slice the butter into pats and arrange them evenly over the top of the cake.
Bake the dump cake for 40 minutes. Let it cool for at least 10 minutes before serving warm.