Step 1

Preheat oven to 350 F.

Step 2

Combine the flour, sugar, baking powder and salt in one bowl and mix.

Step 3

Mash the banana well, and mix it with the oil, vanilla and egg in another bowl.

Step 4

Combine the wet ingredients with the dry ingredients and mix well.

Step 5

Fold in the walnuts and dried blueberries.

Step 6

Divide the dough in half and roll each half into a log about 8 inches long.

Step 7

Flatten each log to about 1/2 an inch high, and place on a lightly greased cookie sheet.

Step 8

Bake for 25 minutes, until the top is lightly brown.

Step 9

Let the rolls cool slightly, and then cut them into 1/2 inch slices.

Step 10

Put the slices on a cookie sheet and bake at 250 F for 15 minutes.

Step 11

Flip the slices over and bake for another 15 minutes.