Cook lentils until al dente (about 20 minutes). Using a mesh colander, run under cold water until chilled, then drain.
To a blender, add ¼ cup of the milk, nut butter, flax meal, vanilla extract, baking powder, date paste, salt, and lentils (It's important that the milk goes in before the lentils; this will help them blend). Blend on low, gradually adding the rest of the milk and increasing the speed until mixture is smooth.
Add lentil mixture of a large bowl. Add oat flour, almond meal, and coconut flour, and mix with the back of a spoon until all flour is incorporated.
Add toppings as desired!
Recipe by Veggie Ninjas at https://www.veggieninjas.com/superpowered-cookie-dough/