Return the mixture to the saucepan and cook over low heat, stirring constantly, until it thickens. Remove from heat and let it cool completely.
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Once the cream has cooled, beat in the butter until smooth and creamy.
To assemble the cake, cut the choux pastry in half and pipe or spoon the mousseline cream onto the bottom half. Place the other half on top and dust with powdered sugar.
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Enjoy this melt-in-your-mouth cake with a cup of coffee or tea for a delightful treat!
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