These blueberry and walnut eclairs have a delicious blueberry jam filling and fondant icing topping that will make you want to make them again and again. Once you’ve mastered choux pastry the filling choices are endless.

Three blueberry and walnut eclairs on a white plate

How to make great choux pastry

  • Make sure you have all of your ingredients ready to go. Once the choux ingredients start cooking you have to act fast if you want the best eclairs.
  • Shoot your flour into the mixture by folding a piece of greaseproof paper in half.
  • You may not need all the eggs. See how the dough in the pan looks. If it’s getting too sloppy stop with the eggs.

Why is my choux pastry soggy?

You need to cook the pastry for longer.  It’s a delicate balance between getting enough water in the pastry to cause the steam to make it puff up to too much that when it comes out of the oven it’s soggy and has collapsed.

Why did my choux pastry not rise?

Does your choux pastry look more like a pancake? This could be due to you adding the egg when the mixture is too warm. Rather than the egg cooking while puffed up in the oven it cooks instantly and won’t rise. Next time allow the flour and water paste to cool a bit longer before beating in the egg.

Learn more tips and tricks on one of our baking courses.

Blueberry and Walnut Eclairs

Course sweet
Cuisine French
Keyword baking, choux pastry, patisserie
Prep Time 25 minutes
Cook Time 45 minutes
Total Time 1 hour 10 minutes
Servings 12
Author Louise


For the choux pastry:

  • 150 g plain Flour
  • 5 large Eggs plus 1 extra egg if needed
  • 195 ml water
  • 85 g soft unsalted butter
  • ¼ tsp fine sea salt
  • 1.5 tsp caster sugar

For the blueberry jam

  • 150 g blueberries fresh or frozen
  • 1 tbsp lemon Juice
  • 150 g jam sugar
  • knob of unsalted butter

For the cream filling

  • 150 g icing sugar
  • 480 ml double cream

Additional ingredients for decoration:

  • 150 g blueberries for additional filling and decoration
  • 200 g fondant icing sugar
  • walnut halves


For the choux pastry:

  1. Preheat your oven to 170°C.

  2. Put the flour in a bowl.

  3. Place the eggs in another bowl and whisk.

  4. In a large saucepan put the water, butter, sunflower oil, salt and caster sugar and bring to the boil. Remove from the heat and stir in the flour, mix until well combined.

  5. Place back on medium heat and cook for around 2 minutes, stirring all the time. You'll notice how the mixture begins to come away from the side of the pan.

  6. Remove pan from the heat and allow to cool for a couple of minutes.

  7. Whisk in the eggs a little at a time until the mixture reaches a thick dropping consistency, you may need to add the extra egg. The mixture is ready when it makes a v-shaped dropping off the spoon. 

  8. Place mixture in a large disposable piping bag, ideally fitted with a 15mm star nozzle and place on one side to cool slightly before piping.

  9. Take a baking sheet and on a piece of baking parchment mark twelve 15cm lines, then turn over so you can see the lines through the parchment.

  10. Dab some spots of the choux pastry mix on the baking tray and stick the parchment to it. Pipe 12 eclairs using the lines you've drawn as a guide. Bake in the centre of the preheated oven for 35 minutes until well risen, golden and crisp.

  11. Remove from oven and allow to cool.

For the blueberry jam:

  1. Put the blueberries in a small food processor and puree.

  2. Place the blueberry puree in a large saucepan with the lemon juice and jam sugar and bring to the boil stirring all the time. Add the knob of butter and boil for 4 minutes.

  3. Pour into a heatproof bowl and leave on one side to cool.

For the cream filling:

  1. In a large bowl whisk together the double cream and icing sugar until it begins to thicken. Do not over whip or it'll be tricky to pipe. 

Eclair assembly:

  1. Cut each eclair neatly in half then pipe a line of blueberry jam on the base of each eclair. 

  2. Now top the jam with piped cream.

  3. Take the fresh blueberries and place a row of them in each base on top of the filling the top with the remaining eclair half. 

For the fondant icing:

  1. Add a little water to the fondant icing sugar until you get a thick paste.

  2. Put in a piping bag ideally fitted with a 15mm flat nozzle.

  3. Pipe a line of fondant over the top of each éclair and decorate with blueberries and walnuts. Serve.

Recipe Notes

You can freeze the eclairs unfilled. 


One thought on “Blueberry and Walnut Eclairs

  1. Anne says:

    Will pop into the farm early tomorrowfor some fresh eggs and make these. I have all the other ingredients in the frisge.

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