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Use "crumbliness" in a sentence
"The cake flour lends the expected soft texture of the traditional cookies, while the finely crushed cornflakes add an unusual crumbliness."
"The flakiness of a well-made butter crust would have a little bit of the flakiness of a croissant, rather than just the crumbliness of a shortbread cookie."
"It is my theory that the peanut butter acts sort of like shortening but without actually giving it a peanut buttery flavor and certainly not the crumbliness I associate with an out-and-out peanut butter cookie."