Chocolate Oat Cake

1 3/4 cups boiling water
1 cup quick-cooking oats
1/2 cup butter or margarine, softened
1 cup sugar
1 cup packed brown sugar
2 eggs
1 3/4 cups all-purpose flour
2 tablespoons baking cocoa
1 teaspoon baking soda
1/2 teaspoon salt
1 (11.5 ounce) package milk chocolate chips, divided
1 cup chopped walnuts

In a bowl, combine water and oats; let stand for 10 minutes. In a large mixing bowl, cream butter and sugars. Add the eggs, one at a time, beating well after each addition. Beat in oat mixture. Combine the flour, cocoa, baking soda and salt; gradually add to creamed mixture. Stir in 1 cup chips.

Pour into a greased 13-in. x 9-in. x 2-in. baking pan. Sprinkle with walnuts and remaining chips. Bake at 350 degrees F for 40-45 minutes or until a toothpick comes out clean. Cool on a wire rack.