Custom plugin with shortcode not working

add_shortcode('myCustomShortcode', 'this_particular_function');

As soon as I looked at my code this morning I realized I was trying to pass the function name ([this_particular_function]) as the shortcode, not the shortcode name ([myCustomShortcode]).

I overlooked this SO many times yesterday trying to look for some complex answer! I am smacking my head on the desk. Everything works great now, my bad.

The answer: Ockham’s razor.