Step #3 Combine flour, baking powder, salt & baking soda; add to creamed mixture & mix well.
Step #4 Press into a greased 13-in.
Step #5 x 9-in.
Step #6 x 2-in.
Step #7 baking pan.
Step #8 Bake at 350 degrees F for 12-15 mins or until golden.
Step #9 Sprinkle top with marshmallows return to oven just until marshmallows begin to puff, about 2 mins.
Step #10 Cool.
Step #11 Meanwhile, butter, mix corn syrup, chips & vanilla in a large saucepan; cook & stir over low heat/flame until chips are melted & mixture is smooth.
Step #12 Remove from the heat; stir in the cereal & peanuts.
Step #13 Evenly spread warm topping over marshmallow layer.