| Preheat oven to 350°F |
| Butter a 2 1/2-qt baking dish |
| 2 Tbs butter | cook over medium, covered, until tender, 10 to 12 min, drain well | fold together, spread in dish | sprinkle over, bake 350°F 30 to 35 min, until golden and bubbling |
| 1 medium yellow onion, chopped |
| 2 1/2 lb yellow squash, sliced 1/4 in thick |
| 1 cup sour cream |
| 2 large eggs, beaten |
| 1 1/2 cups shredded sharp Cheddar cheese |
| 1 tsp salt |
| 1/2 tsp ground black pepper |
| 1 sleeve (about 1 1/4 cups crushed) butter crackers, such as Ritz, crushed | toss together |
| 3 Tbs butter, melted |