Chocolate Eclair

Ingredients

• 1/2 cup unsalted butter
• 1 cup water
• 1 cup flour
• 1/4 teaspoon salt
• 4 large eggs
• 4 cups whole milk
• 1 1/2 cups sugar
• 1/2 cup cornstarch
• 1 pinch salt
• 8 large egg yolks
• 1 tablespoon vanilla extract
• 1/2 cup unsalted butter room temperature
• 1/4 cup semisweet chocolate chips
• 2 tablespoons unsalted butter
• 1 cup powdered sugar
• 1 teaspoon vanilla extract
• 3 tablespoons water