Butter, for baking dish
2 cups whole milk
1/2 cup sugar
1/2 cup firmly packed brown sugar
1 1/2 cups pureed sweet potato
2 teaspoons vanilla extract
1/2 teaspoon ground cinnamon
1/4 teaspoon ground nutmeg
6 egg yolks
2 (1-pound, 4-ounce) loaves white bread, crusts removed
Pecan Crumble, recipe follows
Pecan Crumble:

1 cup all-purpose flour
1 cup firmly packed brown sugar
1 stick cold unsalted butter, diced
1/2 cup quick-cooking oats
1/2 cup toasted and chopped pecans

2 cup s whole milk 1/2 cup sugar 1/2 cup firmly packed brown sugar 1 1/2 cups pureed sweet potato 2 teaspoons vanilla extract 1/2 teaspoon ground cinnamon 1/4 teaspoon ground nutmeg 6 egg yolks 2 (1-pound, 4-ounce) loaves white bread, crusts removed 1 cup all-purpose flour 1 cup firmly packed brown sugar 1 stick cold unsalted butter, diced 1/2 cup quick-cooking oats 1/2 cup toasted and chopped pecans

Preheat the oven to 350 degrees F. Generously butter a 13 by 9-inch baking dish.

In a medium saucepan, combine the milk, sugars, sweet potato puree, vanilla, cinnamon, and nutmeg. Cook over medium-high heat, just until the mixture begins to boil. Remove from the heat and set aside.

In a medium bowl, whisk the egg yolks until smooth and combined. Using a ladle, pour 1/2 cup of the hot milk mixture in a slow, steady stream into the yolks, whisking constantly. Add another 1/2 cup of the hot milk mixture and whisk to combine. Pour the egg mixture into the milk mixture. Cook over medium-high heat, stirring constantly, until it’s thick enough to coat the back of a wooden spoon, about 3 to 5 minutes. Strain the custard and reserve.

Cover the bottom of the baking dish with 1 layer of bread slices. Pour about 1/4 of the custard mixture over the bread. Repeat with remaining bread and custard, ending with custard. Cover and refrigerate for 8 hours or overnight.

Sprinkle the bread pudding with the pecan crumble. Bake until the crumble mixture is golden and the custard is bubbly, about 45 minutes. Serve warm.

Pecan Crumble:

In a medium bowl, combine all the ingredients, and mix with a hand mixer on low speed, until well combined.