I would propose that there are only so many spoonfuls of sweet-silky-smoothness one can handle before a crunch is necessary. It's why Mr. Goodbars (and Cookies 'N' Creme Bars, for that matter) are so superior to plain old Hershey Bars; why banana pudding has Nilla Wafers; and why, no matter how good this no-pie pumpkin pie is is, I'd still prefer it with a crust.
For pastry chefs (and home bakers who are willing to source ingredients from the internet), that crunch comes in the form of feuilletine (pronounced "foo-ye-tine," kind of): super-thin shards of lacey wafer cookies called crêpes dentelles (sold under the brandname Gavottes). As David Lebovitz puts it, the cookies taste like "sunny butter held together with just enough flour to keep them from breaking apart, then caramelized."
Crumbled into smithereens, they're a toasty, caramelly, praline-y textural addition to otherwise velvety desserts.
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You can order feuilletine from the web, or make them at home (by creating, and then destroying, very thin cookies), or you can swap in a clever sub: Christina Tosi of Milk Bar recommends Corn Flakes as a stand-in. My bet is that if you took Corn Flakes, coated them in a mixture of brown butter and granulated sugar, baked them on low heat until crisp and dry, and then crushed them, that'd be an even closer approximation.
Once you get your hands on feuilletine (or a stand-in), here's how to use it:
Or, go straight to the source: Fold feuilletine into the ice cream base at the very end of the churning (as is the case with the pistachio gelato at Maybeck's in San Francisco).
Do like Blossom to Stem does: Take baked and cooled brownies, then add a layer of melted dark chocolate that's been mixed with feuilletine as well as peanut butter blended with shards of caramel.
Or use it to add crunch to a chocolate bark: Confessions of a Chocoholic makes a Double Chocolate Crunch Bark with two layers of chocolate—one milk, one dark, each with crunchy bits of feuilletine folded in—and a sprinkling of additional feuilletine and smoked sea salt.
Fold into chocolate chip cookie dough (or simply press a tablespoon or so into each cookie before baking).
A (former) student of English, a lover of raisins, a user of comma splices. My spirit animal is an eggplant. I'm probably the person who picked all of the cookie dough out of the cookie dough ice cream. For that, I'm sorry.