Nice choice — classic chocolate éclairs are elegant, creamy, and absolutely worth the little bit of work. Below is a complete, foolproof, step-by-step recipe (choux pastry, pastry cream, chocolate glaze, assembly) so you can make about 10–12 éclairs at home.

Classic Chocolate Éclairs — Detailed Recipe

Yield: 10–12 éclairs (about 10–12 cm / 4–5 in long each)
Total time: ~2½–3 hours (active ~60–75 min; plus chilling/cooling)

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Ingredients

A — Choux Pastry (Pâte à Choux)

• ½ cup (120 ml) whole milk
• ½ cup (120 ml) water
• 113 g (1 stick) unsalted butter, cut into pieces
• 1 tbsp (12 g) granulated sugar
• ½ tsp fine salt
• 1 cup (125 g) all-purpose flour, sifted
• 4 large eggs, room temperature (add one at a time)

B — Vanilla Pastry Cream (Crème Pâtissière)

• 2 cups (480 ml) whole milk
• ½ cup (100 g) granulated sugar, divided (¾ + ¼)
• 4 large egg yolks
• 3 tbsp (≈24 g) cornstarch
• 1 tsp vanilla extract
• 2 tbsp (30 g) unsalted butter (optional, for shine & richness)

C — Chocolate Glaze (Simple Ganache Glaze)

• 120 g (4.2 oz) good quality semi-sweet or dark chocolate, chopped
• 120 ml (½ cup) heavy cream
• 1 tbsp unsalted butter (optional, for gloss)

Equipment

• Baking sheet(s)
• Parchment paper or silicone mat
• Piping bags (one large for choux, one fitted with small round tip for filling)
• Medium saucepan, mixing bowls, whisk, spatula
• Fine sieve (optional, for smooth cream)

Method — Overview & Timeline

I recommend making the pastry cream first so it has time to chill, then make the choux, bake shells while the cream cools, prepare ganache, and assemble.

Step 1 — Make the Pastry Cream (do this first)

1. In a medium saucepan, heat milk and ¼ cup (25 g) of the sugar over medium heat until it’s hot and just steaming (don’t boil).
2. In a bowl, whisk together the egg yolks, remaining ¼ cup (25 g) sugar, and cornstarch until pale and smooth.
3. Temper the yolks: slowly pour about one third of the hot milk into the yolk mixture while whisking constantly. Then pour the tempered yolk mix back into the saucepan with remaining milk.
4. Cook over medium heat, whisking constantly, until the mixture thickens and comes to a gentle boil — it should become glossy and thick (coats the back of a spoon). Let boil 20–30 seconds while whisking.
5. Remove from heat, stir in vanilla and the butter until smooth.
6. Pour through a fine sieve into a bowl (for extra smoothness). Cover with plastic wrap pressed directly on the surface to prevent a skin. Chill in fridge at least 1–2 hours (or until fully cold).

Step 2 — Make the Choux Pastry

1. Preheat oven to 200°C (400°F). Line a baking sheet with parchment or a silicone mat. Fit a piping bag with a plain round tip (≈12 mm) or use no tip.
2. In a medium saucepan combine milk, water, butter, sugar, and salt. Heat over medium until butter melts and mixture just comes to a boil.
3. Remove from heat and immediately add all the flour at once. Stir vigorously with a wooden spoon until the mixture forms a smooth ball and pulls away from the sides. Return to very low heat and cook, stirring, 1 minute to drive off a bit of moisture (helps dry the dough).
4. Transfer dough to a bowl (or stand mixer). Let cool 3–5 minutes (so eggs won’t scramble).
5. Add eggs one at a time, beating well after each addition (by hand or with paddle/beaters). After each egg the dough will look like it separates — keep mixing until it becomes smooth and glossy and falls from the spoon in a thick ribbon. You may not need every bit of the 4th egg; dough should be pipeable but hold shape.
   • Test: pipe a small drop on the pan — it should hold a peak and slowly settle.
6. Transfer to piping bag. Pipe 10–12 long logs (10–12 cm / 4–5 in) spaced well apart. For neat edges, wet your finger and smooth the ends.
7. Optional: brush tops lightly with water and dust with a little sugar for shine/crispness.

Step 3 — Bake the Choux

1. Bake at 200°C (400°F) for 10–12 minutes (this gives an initial blast so they rise).
2. Without opening the oven, reduce temperature to 180°C (350°F) and bake an additional 18–22 minutes, until shells are deep golden brown and feel dry. Key: don’t open oven during baking — sudden cool air will collapse them.
3. When done, turn off oven, crack the door and leave shells inside 10 minutes to slowly cool and dry. Then remove to wire rack to cool completely.
4. If shells aren’t hollow enough, poke small holes in the bottom with a skewer to let steam escape.

Step 4 — Prepare Chocolate Glaze

1. Place chopped chocolate in a bowl. Heat heavy cream until it just simmers. Pour cream over chocolate; let sit 1 minute, then stir until smooth. Stir in butter if using for sheen. Let cool a bit — glaze should be pourable but not too hot when you dip éclairs.

Step 5 — Fill the Éclairs

Two common methods: fill from the bottom with a small tip, or slice and fill.

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Method A — Piping (preferred for neatness):

1. Fit a small round tip into a clean piping bag and fill with chilled pastry cream (whisk gently if too stiff).
2. Poke two or three small holes in the bottom of each éclair (use a skewer) and insert the tip to pipe cream into the center until you feel some resistance and the éclair slightly plumps.

Method B — Slice & Fill:

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1. Slice each éclair lengthwise and spoon or pipe the pastry cream into the bottom half, then replace the top.

Step 6 — Glaze & Finish

1. Dip the top of each filled éclair into the chocolate glaze (top down) and let excess drip off. Place on rack to set.
2. Optionally drizzle with contrasting white chocolate or sprinkle chopped nuts, flaky sea salt, or cocoa powder. Chill briefly to set glaze.

Tips & Troubleshooting

• Egg sizes: recipe assumes large eggs. If using very large or medium eggs, adjust; dough consistency rather than strict egg count matters.
• Choux dryness: shells must be dry inside; underbaked choux collapse. If unsure, bake a few minutes longer at lower temp.
• Smooth pastry cream: sieve it and press plastic film on the surface to prevent skin. Chill well before piping.
• Make-ahead: shells can be baked and frozen (cool, freeze on sheet then bag). Thaw before filling. Pastry cream keeps 2–3 days in fridge. Fill éclairs same day for best texture.
• Serving: best same day or within 24 hours. Filled éclairs soften with time as cream moistens shells.

Variations & Ideas

• Chocolate pastry cream, coffee cream, or whipped cream filling.
• Caramel glaze or dusting of powdered sugar.
• Mini éclairs: pipe 6–7 cm logs; reduce bake time ~18–22 min total.

If you want, I can convert this into a short printable two-column recipe card, or give precise gram-only measurements for baking by weight. Want that?