Martin’s favourite Bran Yogurt Blueberry Muffins

3/4 c. all-purpose flour
1/2  c. whole wheat flour
2 tsp. baking powder
1 tsp. baking soda
¼ tsp. salt
¾ c. brown sugar
1 c. bran
1 c. yogurt
1 egg, beaten
½ c. oil
1 tsp. vanilla
¾ c. blueberries
Bake 30 minutes at 350°