Photoshop, how to draw a double line

I just drew a squiggly line with fuzzy edges, then duplicated the layer, then used paintbucket at 166 with black to make the line larger and solid. Then I went to the duplicated layer and used the magic wand tool to select & delete the fuzziness of the line, then I painted the line white, and VOILA! But maybe there's an easier way?

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