Mix, salt, oregano, pepper, pepper flakes and ½ cup water in a medium pot until liquid reduces by half, about 20 minutes.
Add artichokes, peas and olives; cook 10 minutes more.
While cooking, make the filling for the shepherd’s pie.If not eating immediately, pour into an airtight container and freeze. Otherwise, toss with penne and basil and serve.
Microwave on high 2 minutes; stir; microwave 2 minutes more.