Step 1: Preheat oven to 400°F. Coat a 9-by-13-inch baking dish with cooking spray.
Step 2: Combine squash, onion, chiles, jalapeños, and 3/4 cup cheese in a large bowl, Sprinkle with flour; toss to coat.
Step 3: Spread the mixture in the prepared baking dish and cover with foil.
Step 4: Bake the casserole until it is bubbling and the squash is tender, 35 to 45 minutes.
Step 5: Spoon salsa over the casserole and sprinkle with the remaining 1 1/2 cups cheese.
Step 6: Bake, uncovered, until golden and heated through, 20 to 30 minutes.
Step 7: Sprinkle with scallions,avocado and red onion.
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