Summer Squash Gratin - With greens

4 tablespoons butter 6 cups diced summer squash, 1/2-inch dice (yellow or green or combo) 1/2 cup chopped celery 1/4 cup chopped onion 1/2 cup sour cream 1[...]

3 tablespoons olive oil , plus about 1/2 teaspoon olive oil , for the baking dish 1 medium onion , minced 2 lbs zucchini or 2 lbs yellow squash, finely diced[...]

2 tablespoons olive oil 2 medium onions , thinly sliced (14 oz. total) 2 cloves garlic , minced 1 Preheat oven to 375. 2 To cook the onions-- In a medium[...]