Stir grits into boiling water. add salt. Cook 10-20 min, stir frequently, til thickened. Remove from heat. Add cheese, stirring til melted. Saute onion and garlic in butter. Add to grits. Stir in peppers. Add small amount of hot grits to egg yolk, stir in well. Add egg yolk mixture to grits, mixing well. Beat egg whites til stiff. Fold into grits. Spoon into greased casserole. Bake at 350 for 45-50 min.