Step 1

Preheat the oven to 425 degrees F.

Step 2

Pierce each sweet potatoes several times. Place them on a baking sheet.

Step 3

Bake the sweet until tender when pierced with a fork, 1 to 1¼ hours.

Step 4

Let the potatoes rest until they are cool enough to handle. Cut in half lengthwise and scoop out the pulp.

Step 5

Either run the potatoes with a food mill or mash with a potato masher until smooth. Stir in the butter and milk until combined. Season with salt and pepper.

Step 6

Transfer the mashed sweet potatoes to a 8- by 8-inch baking dish.

Step 7

In a medium bowl, combine the breadcrumbs, salt, pepper, blue cheese, Parmesan cheese and olive oil. Toss until the breadcrumbs are moistened and the cheese are combined.

Step 8

Sprinkle the breadcrumbs over the sweet potatoes. Bake for 10 minutes, or until the breadcrumbs are lightly browned. Serve.