Step 1

Heat oven to 375°F. In 3-quart saucepan, mix milk, flour, 1/2 teaspoon thyme, the sage, salt and pepper with wire whisk until blended. Stir in onion. Cook over medium-high heat about 5 minutes, stirring constantly, until bubbly and thickened. Reduce heat to medium.

Step 2

Stir in soup, sour cream, chicken, squash and peas; mix well. Cook over medium heat 3 to 4 minutes, stirring occasionally, until thoroughly heated. Spoon hot chicken mixture into ungreased 12x8-inch (2-quart) glass baking dish.

Step 3

Unroll dough on work surface; gently press dough into 12x8-inch rectangle. Place over chicken mixture. Brush dough with egg white; sprinkle with 1/8 teaspoon thyme.

Step 4

Bake 20 to 25 minutes or until crust is golden brown and filling is bubbly. Let stand 10 minutes before serving.