Preheat the oven to 400F / 200c.
Using a sharp knife, cut the neck (the thinner longer part of the squash) away from the bulbous end that contains the seeds. Discard the part the holds the seeds.
Use a vegetable peeler to remove the skin on the neck of the butternut squash.
Slice the flesh into rounds, they don't have to be too thin, about ⅛ inch. Check that the rounds will fit into your muffin pan and trim if needed. Place the rounds in a large bowl.
Add the butter, honey, sage, garlic and salt and pepper to a small pot. Place on a low heat on the stovetop and melt together.
Pour the honey butter over the butternut squash and gently mix together so that the slices are all coated.
Use your hands to stack the squash in the muffin tin. Spoon any remaining honey butter over the top.
Place in the preheated oven and roast for 20 to 25 minutes until soft. Use a fork to test the donenes.
Let sit for 5 to 10 minutes before serving. I like to place two stacks on top of each other for each person.