Preparation Preheat oven to 425°F. Butter four 1 1/4-cup soufflé dishes. Melt 2 tablespoons butter in large saucepan over medium heat. Add onion and leek; sauté 3 minutes. Mix in 1 1/4 cups whole milk and 1/2 teaspoon salt, then grits; bring to simmer. Reduce heat to low, cover, and cook until thick, stirring occasionally, about 5 minutes. Meanwhile, whisk remaining 1/4 cup milk and yolks in small bowl to blend. Remove grits from heat. Stir in yolk mixture, then green onions and 3/4 cup cheese. Beat whites in medium bowl until stiff but not dry. Fold into grits in 3 additions. Divide mixture among prepared dishes (mixture will come all the way to top of dishes). Sprinkle with 1/4 cup cheese. Bake soufflés until puffed and brown on top, about 18 minutes. Serve immediately.
Preparation Preheat oven to 425°F. Butter four 1 1/4-cup soufflé dishes. Melt 2 tablespoons butter in large saucepan over medium heat. Add onion and leek; sauté 3 minutes. Mix in 1 1/4 cups whole milk and 1/2 teaspoon salt, then grits; bring to simmer. Reduce heat to low, cover, and cook until thick, stirring occasionally, about 5 minutes. Meanwhile, whisk remaining 1/4 cup milk and yolks in small bowl to blend. Remove grits from heat. Stir in yolk mixture, then green onions and 3/4 cup cheese. Beat whites in medium bowl until stiff but not dry. Fold into grits in 3 additions. Divide mixture among prepared dishes (mixture will come all the way to top of dishes). Sprinkle with 1/4 cup cheese. Bake soufflés until puffed and brown on top, about 18 minutes. Serve immediately.