I make cookies with trim from my harvests and I've been fine tuning this process for about a year now. I have found that the sativa/indica traits remain somewhat in the butter, but all feel much more indica due to the absorption/conversion in the liver. Onto the recipe.
1) put on a large (possibly tall) pot of water to boil, half full maybe a bit more
2) add 2 or 3 sticks of unsalted butter, stir/allow to melt completely (2 sticks maybe fully saturated depending on quality of material, if using buds or high grade trim, 3 is recommended)
3) add dried trim or buds. About 2 ounces (sugar leaf) or 1 ounce (buds).
4) lower stove temp to the point where it slowly boils, you want a 'rolling boil' not violent
5) continue to boil for 1 hour, stirring every 10 mins or so.
6) prepare a large METAL bowl to collect everything in your pot. (I say metal bc I have seen bad things with plastic. hot oils + plastic = 2nd & 3rd degree burns on hands)
7) place a strainer (colander) on top and line inside with 2 layer of cheesecloth (cheesecloth is a must, don't make this w/o finding it, coffee filters blow trust me)
8 ) CAREFULLY pour your pot through the strainer/cheesecloth setup taking care not to spill or get plant matter above the edges of the cloth
9) lift strainer and press plant material with a spoon while supporting strainer over your collection bowl.
10) allow this to sit for 15 minutes to cool some, then wrap the edges of the cheese clothe to make a 'sack'. Hold over bowl and squeeze as much better as possible, it will be hot be careful and wait longer if it is still too hot to handle.
11) place your bowl of water and butter in the fridge over night
12) the next day, use a butter knife to carefully 'jab' the edges between the butter and side of your bowl. It's a iceberg you want to break free in as few of pieces as possible.
13) turn the sink on, let it get really cold and then carefully rinse the bottom side of the butter (side that was touching water) to remove plant contaminant. many people skip this step and it's the reason for terrible tasting edibles.
14) break into pieces and place into a tupperware container. in a couple days you may find a few drops of water in the bottom, just carefully drain that off.
15) put your container in the microwave on high for about 1 minute, stirring every 15 seconds, this will liquify the butter and prepare it for baking.
16) toss you left overs in the fridge, good for 1-2 months or freeze for years potentially.
Ok, now bake your cookies using the resulting butter. I recommend the Betty Crocker chocolate chip cookies. They require a entire stick of butter and this helps accomplish the 1 cookie knockout your looking for. Bake as directed replacing the butter, be careful not to over bake.