Prepare a tray with parchment paper and set aside.
Set the pretzels on the tray.
Melt the white chocolate in the microwave in bursts of 15 seconds stirring in between each burst for 10-15 seconds. Patiently melting the chocolate will make sure it doesn't burn!
If needed add the oil to slightly thin the chocolate. Add very slowly and just if the chocolate is too thick. (I usually add about 1/2 teaspoon to 1 full teaspoon to each cup of chocolate chips)
Pour the melted white chocolate into a plastic bag, seal the bag tightly without air, and snip off the very tip with scissors.
Pipe the melted chocolate into the centers of the pretzels
Gently wiggle the pretzels side to side to get the chocolate smooth.
Add a heart sprinkle to the center immediately. Let set at room temperature.