I was experimenting in the kitchen the other day and simply used one tin of tuna, 2 egg yolks (no whites) to make some pretty decent tuna burgers. Just mix them together and make 2 seperate burgers, pop 'em in the oven for 15 minutes and you're ready to feast. Not a bad high protein, high omega 3 snack post gym or before bed.
I also made myself some protein ice cream by simply cutting up a banana and mashing it together, adding around 200ml of almond milk and 2 scoops of 20g protein powder. Pop it in the freezer and enjoy the day after. Not the healthiest but not a bad post workout snack as high GI.