In a heavy saucepan over medium high heat, melt the butter.
Add the brown sugar. Immediately stir in heavy cream and salt. Stir constantly while you bring it to a boil.
As soon as it comes to a boil, continue to stir for 1 more minute. It is very important not to stop stirring.
Take the saucepan off the burner and add the baking soda while still stirring. The caramel mixture will foam up, this is normal and the reaction that you want.
Immediately pour over popcorn and stir so that it is evenly coated.
Bake on a cookie sheet for 30 minutes stirring halfway through.
Melt chocolate and coconut oil over double boiler stirring till melted.
Once melted, pour over popcorn and serve in individual parchment cones.