The present disclosure provides a cosmetic cleanser that is solid at about 25° C., including—;with respect to its weight—;from about 5% to about 90% by weight of alkali salts of fatty acids (soaps); from about 2% to about 50% by weight of acyl glutamate(s); and from about 0.1% to about 10% by weight of betaine (N,N,N-trimethylammonioacetate or N,N,N-trimethylglycine).