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Heat the oil in a medium-size saute pan over medium-high heat. Add the sausage and cook for 3 minutes, stirring occasionally.
Add the onions, celery, bell peppers, salt and cayenne and cook, stirring, until the vegetables are softened, about 5 minutes.
Add the garlic and cook, stirring, for 1 minute. Remove from the heat and stir in 2 tablespoons of the parsley and green onions. Cool the mixture for 10 minutes.
Add the butter to a large cast iron skillet. Place in the oven and melt the butter.
Fold the sausage mixture into the batter.
In another mixing bowl, whip the egg whites with an electric mixer until very stiff and peaks form, then fold into the sausage batter. Pour the batter into the skillet and sprinkle the top with 1/4 cup of the cheese. Bake until is sets, about 45 minutes. Remove from the oven and let stand for 5 minutes. Spoon onto a serving plate and serve. Garnish with remaining cheese and parsley.