Abstract: An apparatus configured for attaching to a conventional cooler and mixing the contents therein, the apparatus including a lid assembly integrated with a mixing assembly. The lid assembly includes a lid having both a hole and an opening to allow the addition of contents to the container and a cover that can be positioned over the opening and secured to the lid. The mixing assembly is integrated with the lid assembly through the hole and includes a centering guide positioned at the bottom of the container, a mixing paddle coupled to the top portion of the centering guide, and a handle operatively coupled to the mixing paddle through the hole. After contents are added to the container through the opening, the cover is positioned over the opening and securely coupled to the lid. The handle is operated to cause the mixing paddle to stir the contents of the container.