1 package Toll House semi-sweet chocolate morsels (12 oz.)
Directions
In large mixer bowl, combine butter or margarine, oats, flour, brown sugar, eggs, walnuts and vanilla. Beat 3 minutes at medium speed or until mixture is light and fluffy. Stir in 1 cup of the chocolate morsels, spread batter in 8 inch square, microwave-safe baking dish; cover dish with waxed paper. Microwave on high power 4 minutes; rotate dish 1/4 turn. Microwave on high power 4-5 minutes longer or until top of cake appears dry and bottom of cake in an even color. Sprinkle remaining 1 cup chocolate morsels over top of warm cake. Let stand 10 minutes. Then spread chocolate evenly over cake. Cool directly on countertop. Cut into serving pieces.