Preheat the oven to 350 degrees and prepare a 9x5 inch loaf pan by greasing and flouring it. Or using a baking spray with flour added.

In a large mixing bowl, add the buttermilk, vegetable oil, butter, egg, and vanilla extract. Whisk it together until it's combined.

Next add the brown sugar and granulated sugar, again whisking until everything is well combined.

Add the flour and the baking soda to the mixture in the mixing bowl. Stir the baking soda just into the top of the flour to evenly disperse it. Then mix the flour mixture into the wet ingredients stirring just until it's combined.

Put the berries and the remaining flour in a ziploc bag and shake it up so that all the berrries are coated in the flour. This will help to keep the berries from sinking to the bottom of the bread.

Carefully fold the berries into the bread batter and then spread the batter evenly in the loaf pan.

Bake the bread at 350 degrees for about 45 minutes to one hour or until the bread has a domed top, is golden brown and a toothpick inserted into the center comes out clean. (There might be some staining on the toothpick from the berries. Just pick another place in the loaf to test.) Remove to a wire cooling rack and let the bread cool in the pan for about 15 minutes before removing to cool completely.