Preheat the oven to 400 degrees F.
Prepare a 12-cup muffin tin by lining it with muffin liners.
In a large bowl, combine the flour, oats, brown sugar, baking powder and salt.
In a small bowl, lightly beat the egg. Add the buttermilk and oil. Mix well to combine.
Pour the buttermilk mixture into the dry ingredients and mix until just moistened.
Fold in cherries.
Distribute the batter evenly among the 12 prepared muffin cups.
Bake for 20-22 minutes until slightly golden brown.
Transfer individual muffins to a wire rack to cool.