Homemade Eclairs

Bahan-bahan (16 porsi)

• 4 large egg yolks, cold or room temperature
• 3 Tablespoons (23g) cornstarch
• 2 cups (480ml) whole milk (do not use low-fat or nondairy)
• 1/2 cup (100g) granulated sugar
• 1 Tablespoon (14g) unsalted butter, softened to room temperature
• 1 teaspoon pure vanilla extract
• seeds scraped from 1/2 vanilla bean (or extra 1/2 teaspoon vanilla extract)
• small pinch salt
• 1 batch choux pastry
• egg wash: 1 egg beaten with 1 Tablespoon milk or water
• 1/2 cup (120ml) heavy cream
• 4 ounces (113g) semi-sweet chocolate, finely chopped