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Preheat oven to 400 degrees. Line a baking sheet with parchment paper.
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In a bowl, mix together flour, white sugar, baking powder, and salt. Once combined, cut in the butter with a fork or pastry cutter until the mixture resembles coarse crumbs.
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Whisk together heavy cream, sour cream, egg, and vanilla extract. Slowly add the wet ingredients into the dry ingredients, and mix until just combined.
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Gently stir in the blueberries and raspberries, and mix until just combined (the berries may break apart while being mixed).
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On a well-floured surface, turn out the scone dough and pat into a small square that's about a 1/2" thick. Cut the rectangle in 9 even squares, then cut each square diagonally, leaving you with 18 mini scones.
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Transfer to the baking sheet.
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Brush each scone with just a bit of heavy cream.
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Bake for 14-16 minutes, or until just golden brown. Allow to cool.