It's helpful to keep the Pyrex on a low setting hotplate while you mix in the cannabis concentrate. If you don't have a hotplate, go ahead and nuke the mixture again if needed. Only a couple seconds at a time (we don't want to overheat the cannabis)
Mix edibles well, mix better, mix again, without whisking which causes bubbles.
Spray coconut oil on molds and pour mixture into molds, spreading as evenly as possible. (there is always some waste, lick the spoon with care!)
Cool marijuana edibles in fridge overnight.
Remove and sprinkle with a finishing powdercoat mixture of 75% powdered sugar/ 25% corn starch. (granulated sugar is also an easy alternative)