Preheat oven to 375F. Line a 12-cup muffin tin
with paper liners.
In a medium bowl, whisk together flour, baking
powder, salt and spices.
In a large bowl, whisk together brown sugar and
egg. Whisk in melted butter, vegetable oil and
vanilla. Working in two or three additions,
alternately stir in flour mixture and
buttermilk, ending with an addition of flour
and mixing only until no streaks of flour
remain visible in the batter. Stir in diced
apple.
Divide batter evenly into prepared muffin cups
filling each to the top, or slightly over.
In a small bowl, stir together coarse sugar and
additional 1/2 tsp ground cinnamon. Sprinkle
generously over muffins.
Bake for 15-18 minutes, until a toothpick
inserted into the center of a muffin comes out
clean and the top springs back when lightly
pressed.
Cool muffins on a wire rack.
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