Place a whole acorn squash into the microwave and microwave for one minute. This will soften it up making it easier to cut through. Now carefully cut the acorn squash in half and remove the seeds using a large spoon.
Place the cut squash onto a rimmed baking sheet lined with parchment paper. Then make cross-hatch slits (about 1/4 inch deep).
Then pour the melted butter into the acorn squash halve along with the brown sugar and pinch of salt. Use a pastry brush to evenly distribute everything.
Preheat your oven to 400°F and bake for about 1 hour or until fork tender.