Beans and rice, combined, are generally an adequate replacement for meat in terms of protein and nutrients. Many Indian dishes feature these two, and also scale back the use of meat substantially. I would advise you look into Indian cooking for some really delicious, easy, lazy (set it and forget it styled curry) meatless dishes. Some of my favorite include Palek Paneer (spinach and Indian cheese), Gobi Aloo (indian style cauliflower and potatoes), and Chana Masala (chickpeas in tomato “gravy”). Here’s an awesome website, Manjula’s Kitchen, where Manjula teaches you how to make these dishes via video and written recipes. She has tons of recipes, I believe all of hers are vegetarian and many are vegan.