This easy vegetarian casserole takes almost no time to prepare. If you make the big batch of quinoa black bean casserole, you’ll have enough to freeze for later. Quinoa Black Bean Casserole “Why don’t you make that lime black bean casserole thing anymore?” my husband asked me. I searched through my internal card file and vaguely remembered an easy vegetarian casserole I made years ago, before we quit eating white rice. His question got me thinking about flavors and substitutions…