Hey @sarahbaker, Welcome to Overgrow!!
I make chocolate edibles but as Rooted said, the best are homemade.
To get ‘up to speed’, check out:
That covers a lot of ground from extraction to recipes & there are other threads covering other aspects.
Brownies are really old school - they were the original edible.
A buddy conned his older sister into making a batch, we all ‘chipped in’ what we had; that was about 1970… 
What surprised us the most was how long the high lasted, I remember one guy was getting a little freaked before the buzz began to tail off.
Cheers
G