01 -
Melt the butter in a large skillet over medium heat. Add the squash, onion, salt, and pepper. Cook, stirring occasionally, until the squash is tender but still holds its shape, about 10 minutes.
02 -
Transfer the cooked squash and onion to a colander. Press gently with the back of a spoon to release excess liquid. Let sit while you prepare the filling.
03 -
In a large bowl, stir together the condensed soup, sour cream, and shredded cheddar until smooth. Fold in the drained squash mixture until evenly coated.
04 -
Spread the filling into a lightly greased 9x13-inch baking dish. In a small bowl, combine the crushed crackers with the melted butter. Sprinkle the crumbs evenly over the top.
05 -
Bake uncovered at 350°F (175°C) for 25 to 30 minutes, until the topping is crisp and golden and the filling is bubbling around the edges. Let rest 10 minutes before serving.