This blueberry buckle recipe comes from my grandmother, but we added the apples and it makes this dessert absolutely amazing!
We have made this recipe with both fresh and frozen blueberries and both work great. If you use frozen blueberries, make sure they are thawed out completely before you fold them into the batter. We made the mistake of putting frozen blueberries into the batter and it was a disaster.
If your batter turns blue when you mix in the blueberries, that is all right because once it bakes, it won't be blue.