Elevate squash from a side dish to center stage with a fast and filling ground beef stuffing. Pattypan squash (which have a squat, round shape) can be found at many farmers’ markets in the summertime, but this savory filling works just as well with regular zucchini or yellow squash. Feta cheese and fresh dill add a Greek accent to stuffed squash. Trying to add more healthy whole grains to your family’s diet? This hearty beef-and-feta filling can be made with a variety of grains. Swap out the white rice for an equal amount of cooked brown rice, quinoa, barley, or farro.