Not sure what cooking hash is but the cookies I made tasted great.

.. trimmed from some plants. Fried them in some butter until they smoked and we were
left with some black sludge that we put into the brownie batter. I remember that hash
brownies were very strong.

was what we called that butter.

It's indeed difficult to gauge the right amount for a few bites of cookie, or brownie, or whatever. If the treat tastes good, it's tempting to try an extra bite that might put you over the top. Then it's time to lay down and wait for the effect to subside. It always does, but it's a real time waster. I've veered away from edibles for this reason. If you take too much, you might be wishing for the four or five hours to pass much more quickly. I can control the drug more easily with dry herb vaping.

You need to know the material's content then do arithmetic to calculate potency per piece. There is a wide range in tolerance to it individually. A trick to speed adsorbs ion is to add lecithin which cuts the onset time in half. Brownies are best measured out 4×4 for 16 pieces, then try half a piece first time. Brownies can be divided and you can freeze some, as they can go bad in a week. Try 20mg per square so 320mg for a tray, melt the hash into butter or oil, you could just go over or under that potency and do 2 or 3 trays at once to not have to weigh it out in portions.

When serious research was done awhile ago the only toxicity was panic attack, and every one has a threshold, for some it's low for others it takes effort to go over the line. When concentrates got popular in Colorado some would get intractable nausea which could be treated with a hot shower.

was like that moment when you say to yourself "the acid is kicking in". Yes, slightly paranoid, also a few mild hallucinations on the periphery of vision. Contrary to what I had assumed might happen, sinking into the couch with no hope of moving for 6 hours, the reality was quite the opposite. I don't think the house has been that clean since.

I grind it fine and replace a portion of the flour with it. I've also made icing and even chocolate mouse with tincture. I made some kicking cherry jam not long ago, a little dab will do ya, you don't need a layer on a PBJ. Just a smear on a cracker will do it.
I've never seen cooking hash, but then again, maybe I wasn't looking for it.
Following the thread, hoping to learn more.