Turn oven on to 350°F (175°C). Put the flour, biscuit crumbs, baking powder and salt into a medium-sized bowl, then stir. Set aside.;
, Beat until light and fluffy. Add eggs, one at a time, beating well after each addition. Add vanilla extract and flour mixture. Beat until a soft dough forms.
 Spread the dough evenly into the pan. Bake in oven for about 15 minutes until golden and set. Put pan on stove top.
 Let stand for about 2 min. until softened. Spread evenly. Sprinkle marshmallows over chocolate in single layer. Press down lightly.
 Put pan on stove top. Let cake stand in pan until cool and chocolate is set. Cut into 24 soft and sweet squares and enjoy!

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Place oven rack in center position.
Put butter and brown sugar into a large bowl.
Grease a 9 X 13 in (22 X 33 cm) pan with a cooking spray.
Sprinkle chocolate chips evenly over bottom layer.
Bake in oven for about 1 minute until the marshmallows begin to soften.
Finished.
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