Fans queue up on weekends for this iconic vanilla slice: a dense, bouncy custard held between flaky puff pastry and crowned with zingy passionfruit icing. Think of this as fancy nostalgia, with its old-school vibe, super-fresh ingredients, real vanilla and a tropical twist. Only a handful are made each weekend, so timing matters. Expect a messy, gloriously sticky bite that ends up all over your face, but worth every crumb. The decor is retro-casual, so dropping in here feels like taking part in a local ritual, rather than grabbing a posh patisserie treat. Chicken sanga afterwards? Always worth it. Multiple locations; goodwaysdeli.com.au

Rightly famous for their toasties, this creative bakery nails the other classics too, like their vintage-style vanilla slice. Layers of pastry crack like a pile of autumn leaves; the vanilla custard is creamy, thick and dotted with real vanilla seeds; and icing sugar is dusted with enthusiasm. The space is full of young creatives sipping house-blend coffee, while the scent of fresh dough lingers in the air. It’s one of those hidden gems locals cling to and visitors include on their ‘must-do’ lists. Just don’t forget to grab a loaf of sourdough before you leave, or you’ll never forgive yourself. Multiple locations; brickfields.com.au

Sure, the crowds come here for the Portuguese tarts, and fair enough, but the vanilla slice also quietly commands its own cult following. Dusted with a touch of cinnamon for a spiced twist and sandwiched between golden, flaky pastry, this slice is anything but standard. The custard’s smooth and voluptuous, with a subtle warmth that lingers. You can grab a single serve if you’re feeling restrained, or go all in on the absurdly glorious 10-inch by 10-inch slab; ideal for birthdays, dessert tables or sheer gluttony. Either way, it’s an unexpected highlight at one of Sydney’s most beloved pastry institutions. 35B New Canterbury Rd, Petersham; sweetbelem.com.au

You’ll find plenty of reasons to linger at this Euro-inspired cafe, but the mille feuille-vanilla slice hybrid is chief among them. Layers of crisp pastry meet rich creme patissiere, topped with whipped cream, a layer of crumbled pastry and a generous sprinkle of icing sugar – the whole thing perfectly walking the line between rustic and refined. Everything here feels like it came from someone’s grandma’s recipe book, but with sharper coffee, nicer crockery and a little more attention to detail. On weekends, slices fly out the door, so get in early, unless you enjoy heartbreak. Don’t say you weren’t warned. 540 Marrickville Rd, Dulwich Hill; honeyandwalnutpatisserie.com.au

This unassuming shopping centre bakery may be best known for its excellent pork rolls, but ignore the cake cabinet at your peril. Vina’s vanilla slice is the kind that makes you believe in lunch-dessert: thick-cut, creamy and unapologetically nostalgic. The pastry layers are crisp and golden, sandwiching a custard that’s set firm but melts like satin. A slick of icing adds more richness; a hint of passionfruit also bringing a little tang to the party. It’s not fancy, but it doesn’t need to be – this is big-hearted, affordable and always fresh. Grab one after your banh mi and thank yourself twice.73 Belmore Rd, Randwick

Step out from the historic Rocks precinct and into a world of equally timeless French charm, complete with a leafy courtyard seating and morning sunlight streaming through big windows. The mille-feuille (AKA French vanilla slice) here is beloved for its balanced sweetness: firm, buttery pastry flanking light custard with a generous cap of icing sugar. Every bite is an indulgence, and though you might be wearing a light dusting of icing sugar yourself afterwards, this is still undeniably dessert with decorum. It’s Parisien cafe culture at its soothing best; perfect for a relaxed slice break after strolling historic laneways. 47 Argyle St, The Rocks; larenaissance.com.au

At this long-running Penrith favourite, you get the rare joy of choosing between not one, but two vanilla slice styles: a refined French version and a classic Aussie number. The former is elegant and dainty, with silky creme patissiere, sweet cream and a chocolate icing lid; the latter is louder, bolder and a bit more nostalgic, with thick custard, passionfruit icing and the kind of old-school heft that demands a fork. Both are made with care and top-quality ingredients, including house-made pastry. Whether you’re in the mood for delicate or decadent, this suburban patisserie has you very well covered. Shop FC005, Nepean Village Shopping Centre, Penrith; polespatisserie.com.au

Tucked into Sydney’s unofficial Little Paris, this charming patisserie serves up a vanilla slice worthy of the Champs-Élysées. With a thriving French expat community and even a bilingual school nearby, Killarney Heights has become a quiet enclave of Gallic culture, and Le Parisien is its buttery beating heart. Their mille-feuille is everything you want it to be: flaky, golden pastry stacked with rich vanilla creme and topped with intricate feathered icing so perfect, it feels almost criminal to slice through. It’s elegant, indulgent and unmistakably French – best enjoyed with a strong coffee and a few words en français. 19 Tramore Pl, Killarney Heights; facebook.com/Le-Parisien-Cafe

Long before Marrickville was hip, this humble Greek bakery was quietly perfecting the art of custard. The vanilla slice here is a thing of beauty, balance and brilliance, double-layered for maximum structural integrity, with flaky pastry that shatters just the right amount, and a creamy custard that knows when to hold firm. The top is finished with a good dusting of icing sugar – no bells or whistles; just textbook perfection. Locals swear by it, and once you try it, you’ll understand why. It’s old-school, unpretentious and made with the kind of confidence that only comes from decades of baking know-how. 412 Illawarra Rd, Marrickville; athenacakeshop.com.au

Whether you’re flying solo or feeding a party of 10, this chic patisserie has a mille-feuille to match. Available in everything from dainty individual serves to shareable slabs, it’s a textural triumph of crisp, golden pastry and thick layers of whipped vanilla cream. Each is finished with a generous dusting of icing sugar that’s simple, snowy and entirely irresistible. There’s no fondant, no fuss – just pure, buttery crunch and sweet, cloudlike filling. It’s the kind of pastry that doesn’t shout for attention but earns it anyway; equally at home on a fancy dessert table or at a solitary afternoon tea. Multiple locations; laviebellebakery.au