Prepare the butternut squash by cutting off the top and bottom, then slicing it lengthwise. Remove the seeds with a spoon, and then peel the skin with a peeler or a sharp knife. Chop the squash into cubes.
Wash and chop the potatoes. You may choose to peel them if desired. Add the potatoes into a large pot along with the cubed butternut squash. Cover them with water, ensuring there is about an inch of water above the vegetables.
Bring the water to a boil and cook until the potatoes are fork-tender, which usually takes around 25 minutes.
Drain the potatoes and squash, and transfer them to the bowl of a stand mixer.
Using the stand mixer, beat the potatoes and squash on low speed. Gradually add the butter, half & half, garlic powder, yellow curry, nutmeg, cumin, coriander, Parmesan cheese, and season with salt and pepper.
Continue beating until the mixture reaches a creamy consistency.
Serve the Squashed Potatoes immediately, and sprinkle some additional nutmeg on top for extra flavor. Enjoy!