Preheat oven to 350°F. Lightly grease an 8″x 8″ pan with spray oil.
In a mixing bowl, mash ripe bananas with the back of a fork until smooth. Add raisins.
Place 1 cup of the oats and the remaining ingredients into a food processor. Pulse several times. Add to the banana mixture.
Mix in the remainder of the oats with a spoon. Pour into a greased pan and gently pat down until the batter is spread.
Bake for 20-25 minutes or until the edges are lightly browned. Allow to completely cool. Cut into 9 squares.
Store in an airtight container on the counter or in the fridge for a longer shelf life.