B & S Diderot — Specialty Store in Bercy, Paris
B & S Diderot on Boulevard Diderot in Bercy is where you go for a Swiss bread, a filled viennoiserie with a crusty shell and a generous cream and chocolate chip centre.
What B & S Diderot is
A specialty shop on Boulevard Diderot in Bercy, a short walk from Reuilly — Diderot station, open 6:30 am to 8:30 pm Monday to Saturday and closed Sunday. Buy the Swiss bread first, a filled viennoiserie with crusty exterior, pastry cream and chocolate chips, with flan bars and sandwiches close behind at about €1 to €10.
Verified November 2026 · 2 independent sources
A counter on Boulevard Diderot
B & S Diderot is a specialty shop on Boulevard Diderot in Bercy, the kind of bakery counter you meet on the way home rather than plan an afternoon around. What you notice first is the display: pastries and viennoiseries laid out in the window, sandwiches and savoury items alongside them.
The Swiss bread is the one to order first, a filled viennoiserie with a crusty exterior and a generous centre of pastry cream and chocolate chips. The flan bars earn their own following, and the galette is made with real butter and crisp puff pastry. If you want something savoury, the sandwiches hold up, and the pain au chocolat sits among the pastries worth taking away.
It works as a counter shop: you order at the display, take your things wrapped, and eat elsewhere. The pace at the till can stretch when it is busy, so come in expecting to wait a few minutes.
Prices run from about €1 to €10, which puts a pastry or a sandwich within easy reach; the mille-feuille slices and the Paris-Brest sit at the upper end of that. Nothing here is set up for a long sit-down, so treat it as a stop rather than a destination meal.
What it suits is a quick, inexpensive buy on the way through Bercy, with the Swiss bread and the flan as the reasons to make the stop.
What to look for
Swiss bread
A filled viennoiserie with a crusty exterior and a generous cream and chocolate chip filling, and the thing to order first.
Flan
The flan bars are worth adding to the order alongside the pastries.
Galette
Made with real butter and crisp puff pastry, at a fair price.
The pick list
What to bring home
Swiss bread
A filled viennoiserie with a crusty exterior and a generous cream and chocolate chip filling; one regular goes to this bakery mainly for the pastries and rates this the best Swiss bread they have eaten.
Flan
The flan is a must-try, and one regular comes back specifically for the flan bars.
Sandwiches
Very good and impeccably priced, and one regular calls them the best sandwiches they have eaten in their life.
Galette
Real butter and crisp puff pastry, with a fair price noted alongside the warm welcome.
Pain au chocolat
One of the pastries a regular returns for, alongside the twisted pastry and the chocolate Viennese.
Who is this for
This suits a quick stop commuter coming off the metro at Reuilly — Diderot who wants a sandwich or a pastry without spending much. It also works for a solo explorer wandering Bercy who wants to try a Swiss bread or a flan bar and carry on. And it fits a budget stretcher, with most of the counter inside a €1 to €10 range.
If you need fresh produce and pantry goods rather than a pastry, La Main Verte Diderot on the same boulevard is the better stop.
The verdict
The Swiss bread, the flan and a serious galette are worth the stop, and it rewards a simple order rather than a full browse.
Keep exploring nearby
La Main Verte Diderot
Supermarket
M. Friaa Au Vieux Moulin
Specialty Store · €1–10
Nous anti-gaspi Paris Reuilly
Specialty Store
La Fournée Saint Antoine
Specialty Store · €1–10
Researched across 2 public sources and confidence-checked November 2026, against our methodology, reviewed by the AisleTrotter editorial team. Spot an error? Tell us — corrections feed straight back into our verification system.
Disclaimer: All curated content and the Trotter Standard verdicts reflect AisleTrotter’s own editorial research and methodology. No paid or editorial influence.