Preheat the oven to 400°F (200°C). Line a baking sheet with parchment paper.
In a medium saucepan, combine the water, unsalted butter, and salt. Heat over medium-high heat until the butter has melted and the mixture begins to boil.
Remove from heat and add the flour. Stir vigorously with a wooden spoon until the mixture forms a smooth dough and pulls away from the sides of the saucepan.
Let the mixture cool for a minute or two, then add the eggs one at a time, beating well after each addition. The mixture should be smooth and glossy.
Transfer the dough to a pastry bag fitted with a large round tip. Pipe the dough onto the prepared baking sheet into 4-inch logs, spacing them about 2 inches apart.
Bake for 25-30 minutes, or until the eclairs are puffed up and golden brown. Remove from the oven and let cool completely.
In a large bowl, whisk together the heavy cream, granulated sugar, and vanilla extract until stiff peaks form. Transfer the mixture to a pastry bag fitted with a small round tip.
Using a sharp knife, carefully cut a small slit in the side of each eclair. Pipe the cream filling into the eclairs through the slit.
In a small saucepan, melt the semisweet chocolate chips and unsalted butter over low heat, stirring constantly, until smooth. Drizzle the chocolate over the eclairs.
Refrigerate the eclairs for at least 1 hour before serving.
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