Preheat oven to 350 degrees fahrenheit. Use a silicone doughnut pan or grease and flour a metal doughnut pan.
In large bowl, combine all ingredients except the blackberries and mix until well combined.
Once well mixed add blackberries and stir lightly to combine.
Spoon batter into prepared doughnut pan.
Bake for 15 to 20 minutes, until an inserted toothpick comes out clean.
Cool 5 minutes in pan then remove and place on wire racks to cool completely.
Makes 6 doughnut