Wave 1 - cookies are a definate no no. They are essentially empty calories and even on Wave 2 and beyond, are intended to be a very rare treat... not every day and not even every week.
Any recipe that uses a white fish would work with tilapia.. I recommend going to allrecipes.com and typing in tilapia in the search box. Lots will come up. Just make it Sonoma friendly.
From the recipe forums -The spinach salmon can be made w Tilapia, and the broiled salmon pesto can be made w tilapia.