Add the chocolate chips, chocolate bar, and almond bark to a large microwave safe bowl. Microwave on high for 1 minute, stir as much as you can.
Microwave in 15 second increments, stirring after each as much as you can, letting the chocolate sit for a couple minutes to continue melting after each segment.
Once the chocolate is melted, add in the mixed nuts, and stir until they are completely coated in the chocolate.
Scoop the nut mixture using a medium cookie scoop, or a couple spoonfuls onto a cookie sheet lined with parchment paper.
Sprinkle coarse sea salt over the top of the clusters before the chocolate is set, if desired.
Let the clusters sit until the chocolate is set.