Banana Cake with White Chocolate Macadamia Frosting

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1 3/4 teaspoons baking powder

2 tablespoons banana pudding mix

1 cup white sugar

1/2 cup buttermilk

1 ripe banana, mashed

1/2 cup butter

2 eggs

Buttercream Frosting, recipe follows

2 teaspoons vanilla extract

Macadamia nuts, dry roasted and finely chopped

1 1/2 cups all-purpose flour

Buttercream Frosting: 

1/2 cup (1 stick) butter, at room temperature

2 to 3 cups confectioners' sugar

1/8 to 1/4 cup melted white baking chocolates

1/2 teaspoon vanilla extract