A mixing apparatus may include a bowl defining at least one bowl opening for contents of the bowl to exit therefrom, and a valve assembly configured to selectively attach to the bowl at the bowl opening and including at least one base portion defining a base opening and configured to selectively receive a seal portion, the seal portion being movable between open and close positions, wherein in the open position, the base opening is unobstructed allowing contents of the bowl exit the bowl via the base opening, and in the closed position, the seal portion blocks the base opening preventing contents from exiting the bowl.