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Preheat oven to 400 F.
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Sift together the dry ingredients in a medium bowl. Set aside.
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In a small bowl, whisk together the sugar, egg, banana, buttermilk, and vanilla.
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Add the wet ingredients into the dry and stir until just combined.
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Break up the Heath Bars in a freezer bag. Fold into the mixture.
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Fill the pan about three-quarters full in each mold with the batter.
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Bake for 11 - 12 minutes (make sure a toothpick comes out clean).
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Allow the donuts to cool completely before icing.