Preparation Steps

• Preheat oven to 375°F (190°C). Grease a 9x13 inch baking dish.
• In a large skillet, melt 1/8 cup butter over medium heat. Add chopped onion and cook until softened, about 5 minutes.
• Stir in the flour and cook for 1 minute, stirring constantly.
• Gradually whisk in the milk until smooth. Bring to a simmer, stirring, and cook until thickened.
• Remove from heat and stir in sour cream and shredded cheddar cheese until melted.
• Season with salt and pepper.
• In a separate bowl, combine the sliced squash and the sauce. Pour into the prepared baking dish.
• In a small bowl, combine breadcrumbs and 1/8 cup melted butter. Sprinkle evenly over the squash mixture.
• Bake for 40 minutes, or until bubbly and lightly browned.