hāk jī màh béng
黑 is black, and 芝麻 is sesame seed, and together 黑芝麻 is black sesame seed paste. 餅 is cookie or (usually round) cake, so 黑芝麻餅 is black sesame seed paste cake.
Glutinous rice with a black sesame paste filling, pan-fried.
sticky rice cake w/ red bean paste
sticky rice cake w/ green tea paste