PREHEAT oven to 350º F. Grease 9-inch-round cake pan. Line bottom of pan with parchment paper; grease.
FOR CAKE:
COMBINE eggs and sugar in large bowl. Stir in flour, melted butter, Choco Bake, vanilla extract and salt until smooth. Pour into prepared pan.
BAKE for 25 minutes or until a wooden pick inserted in the middle comes out clean. Cool on wire rack for 5 minutes. Run knife around edge of cake; cool for an additional 10 minutes. Invert cake onto serving platter. Remove pan and parchment; cool completely.
FOR PEANUT BUTTER LAYER:
BEAT peanut butter, butter and vanilla extract in medium mixer bowl until combined. Gradually beat in powdered sugar. Spread mixture on cake. Refrigerate for 30 minutes.
FOR GANACHE:
HEAT cream in small saucepan to boiling; remove from heat. Add semi-sweet morsels; let stand 5 minutes. Stir; refrigerate for 30 minutes or until mixture is spreadable. Spread chocolate on top and sides of cake.
MELT peanut butter & milk chocolate morsels in resealable plastic bag on MEDIUM-HIGH (70%) power for 30 seconds. Knead bag to mix. If necessary, microwave at additional 10- to 15-second intervals until melted. Cut a small hole from corner of bag; squeeze to drizzle over cake. Store in refrigerator. Let stand for 30 minutes before serving.