yes because thc is fat soulable and stays in fat really well (hence why it takes so long for weed to actually get out of your system) people usually use a double boiler and a shitload of butter and simmer it forawhile then strain out all the weed and use the butter to cook with....but from expereince the cracker thing does work....the reason you use tinfoil in the oven is to keep the peanut butter from dripping every where...though you have to use about a gram of decent weed (2 if scwagg) atleast that's the dosage for me.