Step 1

Preheat oven to 400°F.

Step 2

Toss sweet potato slices with oil, cumin and 1/8 teaspoon salt. Arrange in a single layer on a large rimmed baking sheet. Roast, turning once, until tender, 25 to 30 minutes. Reserve 2 slices about the size of the English muffins. Save the other slices for another use.

Step 3

Meanwhile, mash avocado, salsa, red onion and remaining 1/8 teaspoon salt together on a small plate.

Step 4

Spread half of the avocado mixture on 1 English muffin half. Top with a sweet potato round, an egg and 1/4 cup spinach. Place the remaining muffin half on top. Repeat with the remaining ingredients.