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Step 1: Preheat the oven to 400°F (200°C).
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Step 2: In a medium saucepan, combine milk, sugar, flour, and salt. Cook over medium heat, stirring constantly, until the mixture thickens.
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Step 3: Remove the saucepan from the heat and stir in the vanilla.
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Step 4: Let the mixture cool slightly, then stir in the butter and eggs.
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Step 5: Transfer the mixture to a piping bag and pipe into long, thin shapes on a baking sheet lined with parchment paper.
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Step 6: Bake the eclairs for 15-20 minutes, or until golden brown.
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Step 7: Allow the eclairs to cool completely, then fill with homemade custard.
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Step 8: Melt the chocolate chips in a double boiler or in the microwave in 30-second increments, stirring between each interval.
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Step 9: Dip the top of each eclair into the melted chocolate to coat.
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Step 10: Serve the eclairs immediately and enjoy!