Clicking in just one chainring
Inspect the teeth of the chainring for damage. A single one might be damaged from hitting some obstacle. It may then produce a click when taking up the chain at the top and again as it drops the chain at the bottom of the turn.

The best way to do this would be to suspend the bike and have the chainrings at eye-level. Don't turn the bike upside down because it could change the conditions under which the clicking appears. Also try out whether the clicking appears when the crank is turned backwards.

Good luck and patience because sources of noises are notoriously hard to spot.