I use my 'cheat days' to enjoy foods that are still healthy, but not on my regular diet.
If you normally eat brown rice, try brown rice pasta with some pasta sauce on top.
If you normally eat lean steak, mix it up and buy some lean ground bison. etc.
For my last 'cheat meal' I had brown rice pasta with pasta sauce, lean ground bison, steamed broccoli and a protein bar for dessert