What are some simple, healthy, 300 calorie meals?

With at least 20 grams of protein, and some vegetables. I need ideas for lunch and dinner (I'm ok with rotating 2 or 3 meals throughout the week, instead of having a big variety of meals).

I need at least 1 lunch recipe and 1 dinner recipe to be vegetarian, if possible (if not, that's ok).

I'm going on a low calorie diet for a week (to speed up my weight loss. I'm not doing the diet and then going back to my normal eating - I will continue to lose weight following a healthy, sustainable plan I've made). I'll be dong strength training to prevent muscle loss.

Also, do I need to take a multivitamin during the week I'll be on the low calorie diet? It's only for a week, and I already take hair, skin, and nail vitamins (I think a multivitamin would cause me to have too much of certain vitamins in my system, because my hair vitamins have over 100% DV of some of them).