Preheat oven to 400 degrees. Line a baking sheet with parchment paper or silicone line and set aside.
Slice the sweet potato into even slices, about one quarter to half an inch thick, using a chefs knife or mandoline slicer. Place on on the prepared baking sheet.
Bake for 25 to 30 minutes, until cooked through and slightly toasted. The thickness of your slices may require more or less time.
Bring water to a boil, then reduce to a low simmer. Crack an egg into a fine mesh strainer over a bowl. Allow the watery part of the egg whites to drain into the bowl.
Gently slide the egg into a small ramekin or custard cup. When the water is ready, add the egg and cook for 3 to 3.5 minutes.
Place a sweet potato toast on a small plate.
Remove the avocado from the skin with a large spoon. Place in a small bowl and mash with an avocado masher or fork until smooth. If your avocado is not completely ripe, you will end up with small chunks.
Spread the mashed avocado on top of each slice of toast.
Remove the egg with a slotted spoon and dab with a paper towel to remove any excess moisture.
Slide the egg out on top of the avocado toast. Sprinkle with flaked or regular sea salt and crushed red pepper flakes. Serve immediately.
Sweet potato toast can be made ahead of time, cooled completely, and stored in an airtight container in the refrigerator.
If you do not have parchment paper or a silicone mat, lightly oil both sides of the sweet potato slices before placing on the baking sheet.
If you are not serving your avocado toast immediately after mashing the avocado, stir in a half tablespoon of lemon juice to keep it from oxidizing.
Serving size is one toast with one egg. You will have leftover toast slices if you only make two servings. This also makes the nutrition information a bit wonky.
Spread Dijon mustard on the toast before adding the avocado.
Place 4 steamed asparagus spears on the avocado before adding the egg.
Drizzle with olive oil.
Garnish with watercress or micro greens.
Sprinkle with toasted pine nuts.
Serve with halved cherry tomatoes.
Substitute a Smashed Potato or shredded potatoes for the sweet potato toast.