You can use either butter or oil – I prefer oil because I’ve found they stay crispier.
Dried dill works better than freeze dried dill, in my experience! It’s a bit more finely ground and has a more potent flavor.
The same method would work with pretzels, cheez its, mini saltines, or popcorn!
As written these will be fairly concentrated! If you like a less-concentrated ranch cracker, use two bags of crackers instead of one. (But for me – I love a cracker with tons of ranch flavor on it!)