Butternut Squash Gratin without olive

3 (12 ounce) boxes frozen squash, thawed & drained (I use Birds Eye) or 3 lbs butternut squash, peeled,seeded & cut in cubes 6 tablespoons brown sugar 2[...]

2 lbs butternut squash 1 medium onion , finely chopped (about 1 c.) 1/2 teaspoon salt 1/4 teaspoon pepper 2 tablespoons butter , melted 2 eggs 3/4 cup milk[...]