On a chopping board, slice sweet potatoes lengthwise about a quarter of an inch with the skin on (be carefully not to cut your fingers).

Preheat oven to 400 degrees F (200 C) and line a baking sheet with parchment paper. Arrange sweet potato slices, brush a thin layer of oil on the sweet potato, and season with salt and pepper. Bake for 25-30 minutes, or until a toothpick inserted into the center of the sweet potato is tender. Remove from oven and let cool in the tin for 5 minutes. Then add avocado slices, mash with a fork, and sprinkle salt and crushed red pepper.

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