I suggest protein balls / bites. You can make chocolate, peanut butter, or chocolate chip ones. Here's a recipe on YouTube for some peanut butter ones.
Darebee's sister site, Darebeets, also lets you search for high-protein recipes. Here's a link to them!
Lastly, if you are wanting an even higher concentration of protein compared to other ingredients, then you should buy protein powder and mix it into water. That'll really get you your protein! Could have some yogurt on the side with it! Or even just sprinkle protein powder into plain yogurt, too. They even make protein peanut butter powder.