Name: S'mores Blondies
Yield: 24 bars
Ingredients: 1/2 cup unsalted butter; 2 cups brown sugar (packed); 2 eggs; 1 tablespoon vanilla extract; 1/2 teaspoon salt; 1 teaspoon baking powder; 2 cups all purpose flour; 1 cup Nutella or other chocolate spread; 4-5 cups mini marshmallows