First melt the chocolate (in the microwave or in a water bath).
Arrange the mini pretzels on a plate (if necessary you can cover it with parchment paper, if you are impractical and you are afraid that they will stick to the surface because of the chocolate) and fill the inside with chocolate, leaving the outer edge to form a little heart.
Decorate with sugar hearts or sprinkles, then let the chocolate solidify for about 1 hour.
The pretzel hearts are ready, keep them at room temperature (if it's cold) or in the fridge (if it's hot) until ready to serve them.
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