I like to purchase the turkey burgers from Costco; they are the leanest that I have seen (only 5 grams of fat). You can find them in the freezer section.
I cook them all at once in a large tin pan from Costco, of course. You can cook them from frozen or thaw them, and season them with dry spices. Cook them for 30 minutes at 400 degrees; they do not need to be covered. Take them out of the oven and out of the pan to cool- that way they don't sit in the grease. Slice them when they are cooled and portion them out into 4 oz servings in snack bags. These are a great protein snack to eat with raw carrots or apple slices in the car.