Many good videos on how to make cannabutter can be found on YouTube:
Canna Catering makes some good pre-made cannabutter:
Canna Catering web site
Another good alternative is to use leftover vape material which still has active cannaboids.
Your lungs are healthier, since you are vaporizing instead of smoking, and nothing goes to waste (it's like a bonus high).
Just to spice it up, I will generally grind up and add in either trimmings/kif or some inexpensive bud (there is always some 1/2 off special at my collective).
This morning I started my day with a few Golden Pineapple (18% THC) cookies with my tea, and I will have a pleasant buzz all day until tonight when I am ready to power up my volcano...
ADG