Spread the popcorn on a large parchment-lined baking sheet and pick out any unpopped kernels.

Melt the candy melts in the microwave in 30-second bursts, stirring between each, until smooth and pourable, about 90 seconds total.

Drizzle the melted candy over the popcorn in thin ribbons, then use two spoons to toss gently until about half the popcorn is coated.

Scatter the conversation hearts and sprinkles over the top while the candy coating is still wet so they stick.

Let the popcorn sit at room temperature for 10 minutes, until the candy coating no longer feels tacky.

Break the popcorn into clusters by hand.

Serve the same day; popcorn loses its crunch if it sits candy-coated for more than a day ahead.