In a small saucepan, combine lentils and 1 cup of water; bring to a boil. Reduce heat, cover, and simmer for 10-15 minutes or until lentils are soft. 

Transfer lentils to a food processor, add a few tablespoons of water, then process until lentils are a smooth puree; set aside.

Preheat oven to 350 degrees F. Spray 9x9 inch baking pan with nonstick cooking spray.

Place oats in blender or food processor and process until finely ground and smooth like flour. Don’t worry, it doesn't need to be perfect but it should take a few minutes. Transfer to a large bowl and whisk in baking soda and salt; set aside.

In a large bowl of electric mixer, mix together peanut butter, maple syrup, and vanilla until smooth. Add in lentil puree and mix until well combined.

Fold in oat mixture then gently fold in 1/3 cup of chocolate chips. Pour batter into prepared baking pan and sprinkle remaining chocolate chips over the top. Bake for 20-25 minutes. Remember that you don't have to bake these completely as they are vegan, so if you like a fudgy bar don't keep them in the oven for much longer than 20 minutes! 

Cool brownies completely on wire rack then cut into 16 squares.