Instructions: In large mixer bowl, mix butter, 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 chocolate morsels.

Spread batter into 8" square microwave-safe dish; cover dish with wax paper. Cook on HIGH power 4 minutes; rotate dish 1/4 turn. Cook on HIGH power 4 to 5 minutes longer or until top of cake appears dry and bottom is 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.

Makes 8 to 12 servings.

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