Be sure to decarb your kief in the oven for 30 - 40 minutes at 240 deg F before making your cannabutter, IF you want to maximize your THC level.
By kief, I'm assuming you mean the 'dust' you collect in your grinder. Yes, it's also known as pollen even though it's NOT the same as actual pollen.
10 grams of that type of kief will make VERY POTENT brownies or cookies. Normally I'd recommend 7 - 10 grams of finely chopped good bud and kief is much more concentrated THCA than bud.
And you can substitute cannabutter even if your brownie mix or cookie recipe calls for oil. 1/2 cup cannabutter = 1/2 cup oil.
Remember, edibles will get you TOO stoned if you're not careful. Read all the stories about DOPES that eat shit that is too potent, then do really stupid things. Don't be a DOPE. Eat half of what you think you can eat, wait 90 minutes, then eat more if you're not feeling it.
If you're using kief that you have decarbed, 1/4 of a brownie may be all you need. Or use less kief.