Wash the exterior of the squash and pat dry. Even if you are going to only eat the interior, you always want to wash them to avoid contamination with a knife.
Cut off ends fo the squash. If desired, peel the squash with a potato peeler.
Cut squash in half and remove seeds.
Cut squash into cubes (about 1 - 1 ½") and place into a casserole dish or baking pan.
In a cup or bowl, mix butter and sugar together, then pour over cubes and toss to coat.
Bake in oven 20 minutes. Stir squash and bake an additional 20-25 minutes. Sprinkle with salt and serve.