Step 1

Heat oven to 350°F. In 3-quart saucepan, melt butter over medium heat. Add onion; cook, stirring frequently, until tender. Stir in vegetables, chicken, chicken broth, salt and thyme; heat to boiling. In small bowl, mix 3/4 cup milk and the cornstarch with wire whisk until smooth; stir into chicken mixture. Heat just to boiling. Pour into ungreased 2-quart casserole.

Step 2

In small bowl, stir all topping ingredients except parsley with fork until blended. Drop topping mixture by small spoonfuls over chicken mixture. Sprinkle with parsley.

Step 3

Bake 25 to 30 minutes or until toothpick inserted in center of topping comes out clean.