Lay pretzels in a single layer on a piece of parchment paper.
Melt almond bark according to directions on package and scoop melted bark into a resealable plastic bag. Cut a small hole in the corner of the bag and pipe the melted bark into each pretzel in the form of a heart. Immediately place a jumbo heart candy into the center of heart, pressing down slightly to set. Continue until all pretzels are filled and then let sit until almond bark is set (about 40-45 minutes).
Remove from parchment paper and enjoy.
Notes
If you can't find candy hearts you can use conversation hearts.