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In a bowl, whisk the egg and milk together until fully combined.
Melt the butter in a small saucepan over medium heat.
Pour the egg and milk mixture into the pan and cook gently, stirring constantly, until it thickens into a creamy custard-like texture (about 3-4 minutes).
Remove from heat and let it cool slightly.
Serve as is, or with small pieces of puff pastry on the side for a crispy contrast.
Serving and Storage Tips:
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