The phrase "bland flavor" means that something does not have a strong or noticeable taste. It is plain and not very exciting or flavorful. Full definition
While we may enjoy flavorful food, your baby will enjoy more bland flavors. (kaboutjie.com)
Obviously this is not something one would eat on a regular basis, but it is a much better way to enhance the somewhat bland flavor of beef tenderloin than wrapping in a slice of raw bacon. (grillinfools.com)