Add lentils and water in a medium pot and bring to a boil. Reduce heat to low, cover, and cook for about 10 minutes, or until lentils are tender. Cool.
Preheat oven to 350 degrees Fahrenheit. Line a 9x9 inch baking pan with parchment paper for easy removal. Set aside.
Pulse the oats in a food processor/blender until it turns into flour. Pour into a large bowl and combine with pumpkin pie spice, cinnamon, baking powder, and ground flaxseeds.
Add cooled lentils, pumpkin, milk, applesauce, and vanilla extract into the food processor/blender and process until smooth.
Pour into the bowl with the oatmeal mixture. Do not overmix. Fold in pecans and chocolate chips if using.
Pour the batter into baking pan. Bake 20-25 minutes until the center is set and the inserted toothpick comes out clean.
Allow for it cool in the pan for about 10 minutes before transferring to a cooling rack. COOL COMPLETELY before slicing.
