INGREDIENTS
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Cooking spray
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1 tablespoon olive oil
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1/4 cup diced onion
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1 cup baby spinach leaves, coarsely chopped
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2 ounces shredded part-skim mozzarella cheese (about 1/2 cup)
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1/4 cup 2% reduced-fat milk
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1/2 teaspoon kosher salt
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1/4 teaspoon freshly ground black pepper
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4 large eggs