Preheat oven to 350 degrees F.
Into a medium-sized pot, add lentils and water with ⅛ teapoon salt. Bring to a boil, then reduce heat to low. Cover and simmer for 35 minutes, or until lentils are softened and cooked through.
Remove from heat, season with chili powder, cumin, remaining salt, black pepper, paprika, garlic powder, onion powder, oregano, and red pepper. Stir to combine, and use a potato masher to partially mash lentils.
Into the pot, add undrained kidney beans, undrained diced tomatoes, and tomato sauce. Stir to combine.
Into a prepared 9” x 13” baking dish, add 1½ cups corn chips in an even layer. Pour lentil chili mixture over corn chips. Bake uncovered for 20 minutes.
Top with an even layer of remaining 2½ cups corn chips. Return to oven, and bake 5 minutes more. Sprinkle with scallions and serve warm.