Delicious Cake Mix Banana Cream Pie

INGREDIENTS :

1 package yellow cake mix (regular size), divided
1 large egg, room temperature, lightly beaten
3 tablespoons butter, softened and divided
1 cup cold 2% milk
1 package (3.4 ounces) instant banana cream pudding mix
1 medium banana, sliced
1 carton (8 ounces) cool whip, thawed and divided
1/3 cup Skippy creamy peanut butter
Additional sliced ripe banana….

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