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Preheat oven to 350 degrees. Line a baking sheet with parchment paper; set aside.
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In a medium bowl, whisk together flour, oats, granulated sugar, baking powder, and salt. Using a pastry cutter or your fingers, cut butter into oat mixture until the mixture resembles a coarse meal; whisk in dried cherries. In another medium bowl, mix together egg, buttermilk, and vanilla and almond extracts until well combined. Add egg mixture to flour mixture; mix until well combined.
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Turn out dough onto a lightly floured work surface; roll out to a 1-inch-thick 8-by-6-inch rectangle. Cut biscuits into eight 2-by-3-inch rectangles using a sharp knife; transfer biscuits to prepared baking sheet. Brush biscuits with buttermilk and sprinkle with sanding sugar.
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Transfer biscuits to oven and bake until tops are lightly browned, 18 to 20 minutes. Transfer to a wire rack and let cool slightly before serving.