Pour melted butter into a 13" x 9" baking dish then open both packages of cinnamon rolls. Reserve icing and cut each of the rolls into quarters. Arrange pieces in the bottom of the baking dish along with the melted butter.

Sprinkle cooked and crumbled bacon and nuts evenly over the cinnamon roll pieces then set aside. In a medium-sized mixing bowl, whisk together eggs, milk and vanilla until well combined. Drizzle mixture over the cinnamon rolls. Cover and refrigerate overnight.

Preheat oven to 375 degrees and bake 40–45 minutes or until golden brown. Remove from oven and cool for 10 minutes before drizzling or spreading the reserved icing over the cinnamon roll casserole. Serve immediately.