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For the cake:
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1. Preheat oven to 350 F.
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2. Grease and flour a 9 x 13 x 2 inch baking dish.
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3. In a medium bowl stir together the flour, baking powder, baking soda and salt. Set the dry ingredients to the side.
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4. In a large bowl cream together the butter, peanut butter and sugar until light and fluffy. A handheld mixer is good for this.
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5. Mix in the mashed bananas.
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6. Add in the eggs and vanilla. Mix well.
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7. Add all of the dry ingredients and the buttermilk at once. Mix just until combined.
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8. Pour the batter into the prepared pan and bake for 35 to 40 minutes or until a skewer inserted in the center comes out clean.
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9. Allow the cake to cool completely then frost.
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*Note, if you do not have buttermilk, combine a scant 3/4 cup of milk with 1 1/2 teaspoons of white vinegar and allow it to sit for about 5 minutes.
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For the frosting:
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1. In a medium bowl cream together the butter, peanut butter and the honey with a handheld mixer.
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2. Add the powdered sugar and milk. Mix until well combined.
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*Note: Because of the honey, the frosting will not be fluffy; it's more like a thick glaze.
