Bright, light, and easy is the name of the game with this simple one-pan fish dinner. It all comes together on a single sheet pan thanks to strategic timing. You’ll start with creamy Yukon gold potatoes, add the cod next, and finally stir in chard leaves that wilt and char without turning limp. It all gets dressed up with a quick olive salsa that adds richness, acidity, and a little kick, too. The result is healthy but full of flavor, and perhaps best of all, takes only 15 minutes of hands-on time. Serve with a tart white wine or a medium-bodied rosé and enjoy the easy clean up.