Directions:
1. Preheat oven to 375° F.
2. Crumble 6 cups Doritos with your hands into a large mixing bowl.
3. Add the onion, the chili, the enchilada sauce, tomato sauce and 1½ cups of cheddar cheese to the crumbled Doritos. Stir with a rubber spatula to combine. Place mixture into an 8½ x 11-inch oven proof casserole dish.
4. Bake for 20 minutes.
5. Remove from the oven. Spread the sour cream over the top of the casserole with a large spoon or rubber spatula. Top with remaining 2 cups Doritos. Then sprinkle with the 1/2 cup of the cheddar cheese.
6. Bake for another five minutes and serve.
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