Pierce each sweet potatoes several times. Place them on a baking sheet.
Bake the sweet until tender when pierced with a fork, 1 to 1¼ hours.
Let the potatoes rest until they are cool enough to handle. Cut in half lengthwise and scoop out the pulp.
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.
Transfer the mashed sweet potatoes to a 8- by 8-inch baking dish.
The Topping:
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.
Sprinkle the breadcrumbs over the sweet potatoes. Bake for 10 minutes, or until the breadcrumbs are lightly browned. Serve.
Notes
Please note that I am not a medical or nutritional professional. I provide nutritional information for my recipes as a courtesy to my readers. It is calculated using the built-in recipe card calculator. While I attempt to provide information that is as accurate as possible, you should calculate the nutritional information independently before relying on it.