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Melt the chocolate
Make sure your bowl and utensils are completely dry.
Microwave in 20–30 second bursts, stirring between each, until fully melted and smooth.
OR melt in a heatproof bowl set over a pot of hot (not boiling) water. (see post above for a more detailed guide)
Add the Biscoff
While the chocolate is still warm, add the smooth Biscoff cookie butter.
Whisk or stir until completely smooth, with no streaks. The mixture should be thick, creamy, and pourable.
Pour and level: Pour the mixture into the lined pan. Shake or tap the pan gently to level the top.