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Preheat oven to 350 degrees. Preheat nonstick skillet over high heat for one minute.
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Remove from heat, spray with olive oil spray, then return to stove. Add onions, and reduce heat to medium-high.
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Cook for 30 seconds, then add mushrooms, and cook for 30 more seconds. Add broccoli and sausage, cook for 30 to 60 seconds more. Let cool slightly.
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Spray six portions of a muffin tin with olive oil spray. Stir together egg whites, vegetable and sausage mixture, feta cheese, green onions, sea salt, and black pepper. Pour into six tins.
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Bake for 18 to 20 minutes or until casseroles are set.