Depending on the brand of granules (and the brand of cubes, for that matter), it's usually one teaspoon of granules to one cup of water. The directions are right on the jar's label, though, to be fair, they may be a bit small.
Usually you add 1 cube to make 1 cup of bullion. How many tsp of granules does it say on jar to make 1 cup of bullion? That would be the amount you use to substute for 1 cube.
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