I use 1 to 1.5 ounces of decent quality buds. Preheat oven to desired temp, and check with known good oven thermometer. While the oven is geting to temp I break up the buds. I don't grind them, break them up wearing gloves. Spread on parchment paper on 1" deep baking pan. Cover pan tight with foil, not letting foil touch buds as much as possible. And I time it according to the graph that's below. After it's done in the oven, I melt 2.5 cups of butter in microwave (I use 2.5 cups because evap and absorption will bring it down to 2 cups in the process). I use magic butter machine now, but I've used slow cooker in the past. Put melted butter in machine, add 2 tablespoons of lecithin powder and stir. Put in decarbed buds and stir. Set magical butter machine on butter setting and let it run until done. If using slow cooker, set on high setting to heat up for 30 min, then switch to low. Stir every 5 to 10 minutes. It will be ready in 2 hours.
Pour out through mesh strainer, and use a spoon to press out as much as you can against the mesh strainer.
Use to make cookies, brownies, put on crackers, or whatever you like.
I also use this method with coconut oil. The main difference is you don't need to add as much extra oil because you don't get as much evap from the oil.
Good luck! Peace