As this layered slow-cooker squash casserole recipe cooks, the liquid from the tangy tomatillo salsa and summer squash is absorbed by the quinoa, adding tons of flavor to the final dish.
- Combine tomatillos, tomatoes, pepper, onion, lime juice and salt in a medium bowl.
- Coat a 5- to 6-quart slow cooker with cooking spray. Layer quinoa, 1/3 cup cheese and all of the squash in the slow cooker. Top with another 1/3 cup cheese. Spread the tomatillo mixture on top; but don't stir the ingredients together. (Refrigerate the remaining cheese to use for the topping.)
- Cover and cook on Low for 4 hours. Serve sprinkled with oregano and the remaining 1/3 cup cheese.