I have about 17 grams of stems saved up and I'm wondering if these can be ground up and used to make cannabutter?
Dude, I've used stems and trim to make butter in the past, let me tell you it worked like a charm.
Once I had the butter I would just throw a little bit in the pan and make an omelette or whatever else. 30 minutes later I was high as a kite.
If you have any butter, try out what I'm saying. Put a little in a pan, cook something light and eat it. THC becomes active when heated, maybe that's the problem with your brownies...
Lemme know what happens!