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HEAT oven to 350°F.
PREPARE cake batter and bake in 24 paper-lined muffin cups as directed on package. Cool 30 min. (Cupcakes still need to be warm to fill.)
BEAT pudding mix and milk with whisk 2 min. Add peanut butter; mix well. Spoon into small freezer-weight resealable plastic bag; seal bag. Snip off one corner from bottom of bag. Insert tip of bag into center of each cupcake; pipe in about 1 Tbsp. filling.
MICROWAVE COOL WHIP and chocolate in microwaveable bowl on HIGH 1-1/2 min. or until chocolate is melted and mixture is well blended, stirring after 1 min. Dip tops of cupcakes in glaze; sprinkle with nuts.