Preheat the oven to 400°F. Grease a standard 12-muffin tin or line with paper liners.
Whisk together thoroughly in a medium bowl:
Combine in a large bowl and let stand for 10 minutes:
Stir into the fruit mixture:
Add the flour mixture and fold just until the dry ingredients are moistened. The batter will not be smooth. Divide the batter among the muffin cups. Bake until a toothpick inserted in 1 or 2 of the muffins comes out clean, 14 to 16 minutes. Let cool for 2 to 3 minutes in the pan. If not serving hot, transfer the muffins to a wire rack to cool. Serve as soon as possible, preferably the day they are baked.