Santa Fe Corn Souffle

2 cups fresh corn on the cob
5 tablespoons butter
1/4 cup finely chopped onion
3 large eggs, separated
1/4 cup roasted, peeled, and chopped fresh green chiles
1/2 teaspoon salt

Preheat oven to 375 degrees F degrees.

Using 2 tablespoons of the butter, grease a 1 1/2-quart souffl