Disappearing Marshmallow Bars

My friend brought these to a play date at the park and I think I may have moaned when I bit into one, I know, embarrassing! But they are that good!  The name of these definitely has a double meaning.  The first is that the marshmallows really do disappear when you cook them and the second is that the bars, themselves, disappear quickly because no one can keep their hands off! It is truly a sacrifice to wait for them to cool!  I never seem to be able to make it until they are completely cool before eating my first 1 or 4!

Disappearing Marshmallow Bars

1 cup butterscotch chips
1/2 cup butter (1 stick)
1 1/2 cups flour
1 cup brown sugar
2 t baking powder
1/2 t salt
1 t vanilla
2 eggs
2 cups mini marshmallows
1 1/2 cups chocolate chips

Heat oven to 350.  Grease a 9x13 pan with cooking spray.  In a sauce pan, over medium heat melt the butter and butterscotch chips together.  Stir constantly until smooth.  Be careful not to over heat these or  ooh them too long, they will separate. (I had this happen, I used an immersion blender to bring them back together).

Cool butterscotch and butter to room temperature.  In a large bowl mix together the flour, brown sugar, baking powder, salt, vanilla, eggs and butterscotch mixture, until smooth.  The batter will be thick.  Now stir in the marshmallows and chocolate chips.  Spread the batter into the prepared pan.

Bake for 25-30 minutes.  The center will feel a little soft, but will firm while cooling.  Let cool for 2-3 hours before cutting, if you can!