1 c. (2 sticks) butter, softened
1 1/3 c. Quaker Oats (quick or old fashioned, uncooked)
1/2 c. all-purpose flour
1 c. firmly packed brown sugar
1/2 c. chopped walnuts (optional)
2 eggs
1 tsp. vanilla
1 (12 oz.) pkg. Nestle Toll House semi-sweet chocolate morsels, divided

Combine all ingredients except chocolate morsels. Beat 3 minutes at medium speed of electric mixer until creamy. Stir in 1 cup chocolate morsels. Spread batter into 8 inch square microwaveable dish; cover with waxed paper. Microwave at HIGH 4 minutes; rotate dish 1/4 turn. Microwave at HIGH an additional 4 to 5 minutes or until top appears dry. Sprinkle remaining chocolate morsels over top of warm cake. Let stand 10 minutes; spread over cake. Cool. Cut into squares. 12 squares.