Preheat the oven to 350 degrees.
On a baking sheet, bake the sweet potatoes for 1 ½ hours or until they are tender. Cool the sweet potatoes so they can be handled safely.
Peel the sweet potatoes and place the sweet potato pulp in a large bowl.
Spray a 9x13 casserole dish with nonstick cooking spray and set aside.
Mash the sweet potatoes with a potato masher. Combine the bacon (reserving 2 tablespoons for topping), sour cream, 1/4 cup butter, salt, and pepper with the mashed sweet potato until well blended.
Using a large ice cream scoop, place the potato mixture in the prepared casserole dish,forming tight rows.
Mix the bread crumbs with 1 tablespoon of melted butter in a small bowl and sprinkle the topping evenly over the top of the potatoes. Drop the bacon pieces and chopped pecans over the top.
Place the baking dish in the oven, uncovered and bake for 30 minutes or until thoroughly heated and the bread crumbs are beginning to get lightly browned.