
This classic layered dessert stacks a tender vanilla cake around a rich, silky pastry cream made with egg yolks and just a touch of butter for smoothness, all finished with a glossy semisweet chocolate ganache that drips down the sides in that signature Boston Cream Pie way. The pastry cream gets whisked and tempered slowly on the stovetop until it's thick, glossy, and studded with real vanilla flavor, then chilled until set so it slices cleanly between the layers. The cake itself bakes up soft and springy, sturdy enough to split into two even rounds without crumbling. Corn syrup keeps that ganache pourable and shiny rather than dull, so every slice gets that bakery-case sheen. It's an impressive make-ahead dessert that holds up beautifully in the fridge, and it's a solid pick for a gluten free dessert spread without sacrificing any of the original's layered drama.
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Make the pastry cream: Whisk the egg yolks, sugar, cornstarch, and salt together in a medium bowl until pale and smooth, about 1 minute. Heat the milk in a medium saucepan over medium heat until steaming and small bubbles appear around the edges, about 4 minutes — do not boil.
Slowly pour about half the hot milk into the yolk mixture in a thin stream, whisking constantly to temper the eggs. Pour the tempered mixture back into the saucepan and cook over medium heat, whisking constantly, until the cream thickens noticeably and large bubbles burst at the surface, about 3–4 minutes. Continue whisking for 1 full minute after the first bubble appears to cook out the starch.
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