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Peanut/nut butter! Slash adding nuts to meals where possible (e.g., scoop of nut butter in oatmeal, handful of nuts on salads or stir-fry, etc)

Could you add a scoop of protein powder to your yogurt? There are also yogurts that will give you a lot more than 10g in a serving so you could look for those. Fage 2% Greek has like 20g of protein and about 150 calories. Oikos protein yogurt has only something like 120 calories and 15g of protein.

I'll try to think of other ideas!

Try hemp seeds. One serving is 3 tablespoons, so you can easily ramp that up. They are a whole protein, taste a little nutty like walnuts. I add them to my salad, and don't even notice them.
You can also try chia seeds - they are not as high in protein as hemp, so this may only be a snack. I would make a fruit 'pudding' by pureeing raspberries and cantaloupe and letting the chia seeds soak in overnight. I'd make a weeks worth at a time.
I make ranch dressing out of Greek yogurt, and then eat a 1 cup of dip with veggies as lunch. It tastes like junk food, buts its all good for you! And its a way to eat more Greek yogurt without it all being savory. So perhaps for one meal you can have a sweet Greek yogurt cup and then a savory one, so that you are sticking with just one protein?
I get a lot of good ideas for vegetarian meals from http://www.vegetariantimes.com.

I'm not sure why you can't eat eggs, but if its simple dislike you may want to try just egg whites. I'm not a fan of egg yolks so whites are my go to. Just buy the box in the store. They don't really taste like much, I add spices like cumin and chili powder or Italian seasoning. It takes a lot of egg whites to get a good amount of protein, but after you get used to eating that way you will be fine.

Good Luck!

@Banana330: I'm a registered dietitian - honestly that theory sounds really weird, I have never heard of that and can't figure out how that would work.

Lentils, chickpeas, hummus, green peas, quinoa, peanut butter, black beans, tofu, edamame, spinach, broccoli.

Tvp (texturized vegetable protein) comes in different sizes and shapes. Throw it into a pasta sauce or chili and it soaks up the liquid and resembles ground beef or bigger beef chunks. Disclaimer, the big chunks are chewy. My husband doesn't like them, but I love it as long as they have soaked up enough liquid. Greek yoghurt has lots of protein and comes in different degrees of milk fat content. Yellow and green split peas have lots of protein and iron so they're good in soups and stews and can be pureed for a nicer texture. You can throw tvp or split peas in a pasta sauce and then use that for pasta. Black bean (or any other type of bean) burgers. These can also be made with lentils instead. You can also make a bean paste (think like pate) with garlic and herbs and spread it on toast or crackers. It's delicious! I also use fake bacon to make an egg mcmuffin type sandwich with English muffins for breakfast.

Quinoa casseroles are good. There are a bunch of types on Pinterest. Nut loaf is good too with gravy on it or chilled and sliced in a sandwich with mustard (sort of like meat loaf I guess). You can make it with any type of nut(s) and mix it onions, garlic, herbs, and grated vegetables in it.

I'm skeptical of the premise, but I'd start by getting a higher protein yogurt. I don't really get how you would apply the "no mixing" rule. Grains have protein and some vegetables do too, does that mean you can't eat those at the same time as lentils?

Anyhow, two things that haven't been mentioned yet: tempeh and seitan. They'll be at a place like Whole Foods, if your regular store doesn't have them.