Combine first 4 ingredients in a 1-quart glass measure; stir well. Gradually add water and milk, stirring with a wire whisk until blended. Stir in walnuts. Microwave at HIGH 4 minutes or until thickened and bubbly, stirring with a wire whisk every 2 minutes. Stir in remaining ingredients. Serve warm or at room temperature over vanilla frozen yogurt. Yield: 1 cup plus 3 tablespoons (serving size: 1 tablespoon). Calories 30 (39% from fat), protein 0.7g, Fat 1.3g (Sat 0.1g, Mono 0.3g, Poly 0.8g), Carb 3.7g, Fiber 0.1g, Chol 0mg, iron 0.2mg, Sodium 19mg, calcium 9mg sauce21