What a brioche feuilletée is
Two techniques applied to one dough. An enriched French yeast dough - wheat flour with a high proportion of butter and egg. Sits in the viennoiserie category. And Folding fat into dough in layers so it puffs into leaves. Used for croissants, puff pastry and brioche feuilletee.
So a brioche feuilletée is a rich yeasted dough that has additionally had butter folded into it in sheets. It rises twice over: once by fermentation, like any brioche, and again in the oven as steam forces the laminated layers apart. The result has the flavour and the tenderness of brioche with the visible leaf structure of a croissant.
The name is sometimes used loosely for a brioche that is merely swirled or filled. Properly it means laminated: folded, with butter in continuous sheets between sheets of dough.
Why the two techniques fight
Lamination wants a dough that is cold, relaxed and strong: cold so the butter stays as a sheet, relaxed so it rolls without tearing, strong so the layers survive being rolled thin. Enrichment delivers the opposite of the third and complicates the first two.
Butter, egg and sugar all weaken the gluten network, so an enriched dough is slacker and tears more readily than a lean one. And the dough already contains a great deal of fat before any is folded in, so it softens faster at room temperature, and the working window between too firm to roll and too warm to hold layers is narrower than for puff pastry.
Meanwhile the yeast does not pause. Lamination requires rest between turns, and in a yeasted dough those rests are also fermentation, so the dough is changing while it waits. That is the real difficulty and it is a scheduling problem rather than a technical one: every rest has to be long enough to relax the gluten and firm the butter, and short enough that the dough has not over-proved by the last turn.
Which is why these doughs are worked cold throughout and why the rests happen in a refrigerator rather than on a bench. Cold slows the yeast and firms the butter with the same action, resolving both constraints at once.
How many folds
Fewer than for puff pastry, for the reasons above: each rolling is a chance for the sheets to merge, and an enriched dough tolerates fewer of them. The arithmetic is the same as for any laminated dough: Layer arithmetic is deterministic: each SINGLE (letter) fold triples the layers, each DOUBLE (book) fold quadruples them. Three single folds gives 3x3x3 = 27 layers.
In practice that means a brioche feuilletée is usually built on two or three turns rather than the higher counts used for croissant or puff. Two doubles give sixteen layers; three singles give twenty-seven. Both are ample for a visible leaf structure in an enriched dough, where the richness is doing part of the work that layer count does elsewhere.
Pushing the count higher is where it goes wrong. Past the point where layers are thinner than the butter can hold as a sheet, they merge and the lift collapses, and in an already-rich dough that threshold arrives sooner. Overworked laminated brioche is dense and greasy rather than leafy, and it cannot be recovered. The full fold arithmetic is at the folding page.
Reading a formula for one
Because the butter arrives in two places, in the dough and in the lamination, a recipe's total butter figure is not comparable with a plain brioche's unless the two are separated. A formula that looks extravagantly rich may be modest in the dough with most of the butter laminated in, or the reverse, and the two behave completely differently.
The useful habit is to express both figures against the flour weight, as with any dough: butter-in-dough and butter-for-lamination as separate percentages. That makes two recipes comparable and makes visible which one is really an enriched dough with a little lamination and which is a laminated dough that happens to be enriched. How to read a formula that way is set out at brioche and baker's percentage.
Questions about laminated brioche
What is a brioche feuilletée?
An enriched brioche dough that has additionally had butter folded into it in sheets, so it rises twice: by fermentation, and then by steam forcing the layers apart. It has brioche flavour with a croissant’s leaf structure.
Why is it harder than croissant dough?
Because the enrichment weakens the gluten that lamination depends on, and the dough already contains a lot of fat so it softens faster. The working window between too firm to roll and too warm to hold layers is narrower.
How many folds should it have?
Fewer than puff pastry, usually two or three turns. Two double folds give sixteen layers, three singles give twenty-seven, and both are ample in a dough this rich. More rollings mean more chances for the butter to merge.
Why does everything happen in the fridge?
Cold does two jobs at once: it slows the fermentation that would otherwise continue through the lamination rests, and it firms the butter so it stays as a sheet rather than smearing into the dough.
How do I compare two recipes for this?
Separate the butter in the dough from the butter used for lamination and express both as percentages of the flour. A single total figure hides which kind of dough it actually is.