Bring milk, minced garlic, and 1 teaspoon salt to a boil in a medium saucepan; gradually stir in grits. Cover, reduce heat, and simmer, stirring occasionally, 10 minutes.
Whisk in blue cheese and butter until melted. Whisk in remaining 1/4 teaspoon salt, cream, and remaining ingredients; pour into a lightly greased 1 1/2-quart soufflé dish.
Bake at 325° for 1 hour. (Center may be slightly soft.)