Bring 2 Tbsp. butter, next 4 ingredients, and 4 1/2 cups water to a boil in a medium-size Dutch oven over medium-high heat. Gradually whisk in grits, and bring to a boil. Reduce heat to medium-low, and simmer, stirring occasionally, 10 to 15 minutes or until thickened. Stir in cheese and remaining 2 Tbsp. butter until melted. Serve immediately.