Can't even remember when or where I got this recipe but I have enjoyed it since I was little. Not a difficult recipe for kids to make but requires some supervision with the stove top cooking.
Preheat oven to 350 degrees F.
Grease an 8-inch square baking pan.
In a small bowl, combine flour, baking powder, and salt; set aside.
In a medium saucepan, melt butterscotch chips, brown sugar, and butter over medium heat; stirring constantly.
Remove from heat.
Add egg and vanilla extract; mix well.
Add flour mixture; mix well.
Fold in marshmallows and nuts.
Spread in prepared pan.
Bake for 20 to 25 minutes.
Cool on wire rack.
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