Preheat oven to 375. Coat a large Dutch oven with cooking spray and heat over medium-high heat. Add onion; saute 4 minutes or until tender. Add spinach; saute 1.5 minutes or until spinach wilts. Combine provolone, parsley, salt, pepper, eggs and ricotta in a large bowl. Place squash in a microwave-safe bowl. Cover and cook on high for 5 minutes or until tender. Puree in blender.
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