First, preheat the oven to 375°F and line a baking sheet with parchment paper.
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In a saucepan, bring the water, milk, and butter to a boil. Then, add the flour and salt, and stir until the mixture forms a ball.
Transfer the dough to a mixing bowl and let it cool slightly. Then, one by one, add the eggs and mix until smooth.
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Next, pipe the dough onto the prepared baking sheet to form small mounds. Bake for 30-35 minutes or until golden brown and puffed. Let them cool completely before filling.
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To make the mousseline cream, start by heating the milk in a saucepan until it just begins to boil.
In a separate bowl, whisk together the sugar, flour, and eggs. Gradually pour the hot milk into the egg mixture, whisking constantly.
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