1Place the squash in a microwave-safe container. Microwave for 8 minutes, or until it can be easily pierced with a knife but is still firm. Or if you are using the oven for baking other foods, you can bake the squash in the oven. Cut it in half, wrap in foil, and bake at 375 or 400 degrees for 30 to 45 minutes, or until tender. Either way, this step can be done ahead of time. Let the squash cool until it can be easily handled. Split it in half, remove the seeds and fibers, and scoop the flesh away from the skin. Cut into large dice and set aside until needed.
3Add the broth, spinach, peas, and diced squash. Cook just until the spinach is wilted but still bright green and everything is well heated through.