Can I Cook With This? Please Help!

I just trimmed some branches that were hiding in no-light areas of my plant. I trimmed off the weak buds/trim around them and it weighs 2oz. I chopped it up into smaller parts so it will dry quicker.

Can I use this to make bhang or cannabutter?

decarb it and make cannamilk with it

Maybe I'll start with making a firecracker. What temp should the oven never exceed in which burns the thc out?

200C, or 392F, is the magic number when THC vaporizes so you may want to keep it below that. But you dont even need to go that high with temps, when making cannabutter you are extracting the thc out into the fat at the temperature of boiling.
Here is a good recipe to make cannabutter step by step:
http://www.420magazine.com/forums/420-kitchen/37701-cannabutter-7-easy-steps.html

Enjoy your edibles!