Preheat the oven to 400 degrees. Line a 12-slot muffin tin with muffin liners. If using paper liners, spray each one lightly with cooking oil spray to prevent sticking. Set aside.
In a large bowl, whisk together the egg, milk and oil. Add the flour, sugar, baking powder, ginger, salt and vanilla extract. Stir until smooth, about 1 minute, and then let sit for 10 minutes. Fold in the blackberries
Divide the batter evenly among the 12 muffin liners.
Slide the muffin tin into the preheated oven and bake for 18-20 minutes until golden. A toothpick inserted into the center of the muffins should come out cleanly.
Remove from the oven. These can be enjoyed immediately, or stored in an airtight container for up to five days.
Recipe by Maine Course at https://mainecourse.bdnblogs.com/2017/01/10/recipes/a-little-kindness-goes-a-long-way-and-a-recipe-for-blackberry-ginger-muffins/