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Export 8 ingredients for grocery delivery
Step 1
Heat oven to 350°F. Butter an 8-inch baking dish, round or square.
Step 2
In a medium pot, cover squash with cold water, place a lid on top and bring to a boil over high heat. When boiling, reduce heat so that the water just simmers and cook squash for about 15 min. or until tender. Rinse under cold water; drain. (Do-Ahead: at this point the squash can be stored for up to two days until you are ready to assemble the gratin.)
Step 3
Heat olive oil in a non-stick pan and add onions. Sauté on medium heat, stirring often, until softened. Set aside to cool slightly.
Step 4
In a medium bowl, beat egg, salt and mayonnaise together. Add 1/3 cup of Parmesan, panko, sautéed onion and squash and fold together gently to combine. Season with pepper and more salt, if needed.
Step 5
Spoon in to prepared baking dish and top with remaining 1/3 cup of cheese. Bake 1 hour or until heated through and cheese is slightly browned. Serve hot.
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