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Preheat the oven to 350F.
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Mash the blackberries with the melted butter.
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Mix in the sugars, egg, cinnamon, vanilla, sour cream and lemon zest.
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Sprinkle baking soda over the mixture.
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Add the flours, rolled oats and salt. Mix until just combined.
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Pour the mixture into a greased loaf bread pan.
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Sprinkle the top with the rolled oats.
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Bake for about 45 minutes, checking with a toothpick to make sure it's done. Let cool on a rack.