Ingredients:
- 1 cup (240ml) water
- 1/2 cup (113g) unsalted butter, cut into cubes
- 1/4 teaspoon salt
- 1 cup (120g) all-purpose flour
- 4 large eggs
- 2 cups (473ml) whole milk
- 1/2 cup (100g) granulated sugar
- 1/4 cup (30g) cornstarch
- 1/4 teaspoon salt
- 4 large egg yolks
- 2 tablespoons (28g) unsalted butter
- 1 teaspoon vanilla extract
- 8 ounces (225g) semi-sweet chocolate, finely chopped
- 1 cup (240ml) heavy cream
Instructions:
- Combine water, butter, and salt in a saucepan and bring to a boil. Add flour all at once and stir vigorously until a smooth dough forms and pulls away from the sides of the pan.
- Transfer dough to a mixing bowl and let it cool slightly (about 5 minutes) to prevent cooking the eggs.
- Beat in eggs one at a time, ensuring each is fully incorporated before adding the next. The dough should be smooth and pipeable.
- Transfer the dough to a piping bag. Pipe 4-inch long strips onto a prepared baking sheet.
- Bake in a preheated oven (375°F/190°C) for 30-35 minutes, or until golden brown and puffed up. Reduce the oven temperature to 325°F (160°C) during the last 10 minutes of baking if the éclairs are browning too quickly.
- Let éclairs cool completely on a wire rack.
- Whisk together milk, sugar, cornstarch, salt, and egg yolks in a saucepan. Cook over medium heat, stirring constantly, until thickened. Remove from heat and stir in butter and vanilla.
- Transfer the filling to a bowl, cover with plastic wrap (pressing it directly onto the surface to prevent a skin from forming), and chill in the refrigerator for at least 30 minutes.
- Place chopped chocolate in a heat-proof bowl. Heat heavy cream in a saucepan until simmering. Pour hot cream over chocolate and let sit for 1 minute, then whisk until smooth.
- Cut the cooled éclairs in half horizontally. Fill with the chilled vanilla cream.
- Dip the top half of each éclair into the chocolate ganache.
- Chill the assembled éclairs for at least 15 minutes before serving to allow the ganache to set.