Preheat oven to 400 degrees Fahrenheit and line a baking pan with parchment paper.

Halve the butternut squash and place it on the prepared baking pan, cut side up.

In a small bowl, combine melted margarine, maple syrup, ground cinnamon, and brown sugar.

Brush half of the maple-cinnamon mixture evenly over the cut surfaces of the squash.

Bake in the preheated oven for 45 minutes, or until the squash is tender.

Brush the squash with the remaining maple-cinnamon mixture halfway through baking, and again near the end to glaze.