In a large mixing bowl, combine oats and buttermilk. Let sit for 30 minutes.
2 cups rolled oats, 2 cups buttermilk
Preheat oven to 400 degrees. Lightly spray a loaf pan with nonstick cooking spray. Set aside.
In a small mixing bowl, whisk together flour, baking powder, baking soda, salt, cinnamon and ginger.
2 cups flour, 2 teaspoon baking powder, 1 teaspoon baking soda, 1 teaspoon salt, 1 1/2 teaspoon cinnamon, 1/4 teaspoon ground ginger
Add brown sugar and eggs to bowl of oats. Stir in melted butter and vanilla extract.
1 cup brown sugar, 2 large eggs, 1 cup butter, 1 teaspoon vanilla extract
Mix in dry ingredients until just combined.
Toss blueberries with 1 tsp flour. Stir into batter.
1 1/2 cups fresh blueberries, 1 teaspoon flour
Add batter into prepared loaf pan. Bake in preheated oven for 35 minutes. Reduce oven heat to 375 and bake for an additional 30 minutes or until center is set and top is lightly browned. Remove from oven and let cool completely.