Add one cup of glue and 1/2 a cup of water into the bowl.
Add green food coloring (just a drop) and your glow in the dark powder and stir.
Fill your measuring cup 3/4 of the way full of starch. Carefully pour the starch into the glue cream mixture while you stir.
It's easy to add too much starch to slime, so stop adding starch as soon as the slime "gels." But, if your slime is really sticky, you may need to add a bit more starch.
Place the slime outside in bright sunlight for a hour, then bring it back inside!