Yellow Squash Au Gratin

4 medium yellow summer squash, thinly sliced
1 medium onion, minced
1/3 c. sour cream
1 large egg, beaten
4 T. butter, melted, divided
2 t. sugar
1/2 t. salt
1/3 c. bread crumbs

Steam the squash until very tender. Mash it in a large bowl until almost smooth. Drain out any liquid.

Preheat oven to 375 degrees.

Mix the onion, sour cream, egg, 2 T. of the melted butter, sugar, and salt into the squash.

Scrape the mixture into a medium gratin dish of 8" square baking dish. Sprinkle the bread crumbs on top and drizzle on the remaining melted butter. Bake 45 minutes. Let sit 10 minutes before serving.

Serves 4-6.

Adapted from Quick Vegetarian Pleasures, p. 182.