1 cup butter
1/4 cup brown sugar
1 (1 ounce) square unsweetened chocolate
1 cup white sugar
3 eggs
2 teaspoons vanilla extract
1 cup rolled oats
1 cup mini marshmallows
1 cup rolled semisweet chocolate chips
1 cup all-purpose flour
1 teaspoon baking powder
1 tablespoon baking soda
1/2 teaspoon salt
1 cup sliced almonds
2 chocolate pecan halves
Preheat oven to 375 degrees F (190 degrees C).
Beat butter and brown sugar in large bowl until smooth. Stir together in another large bowl. Beat in chocolate and sugar until smooth. Stir in eggs, vanilla and marshmallows. Stir in oats and mini marshmallows. Stir in chocolate chips and flour. Pour batter into prepared pan.
Bake in preheated oven for 20 to 25 minutes or until the edges of the pan are lightly browned. Cool completely before removing from pan. Cool completely. Refrigerate for at least 2 hours before cutting into bars. Store at room temperature.