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Ingredients

• 1/2 cup unsalted butter, room temperature, plus more for greasing pan.
• 6 sweet potatoes (about 4lbs)
• 2 large eggs, room temperature
• 1 14-oz can sweetened condensed milk
• 1/4 cup granulated sugar
• 1 tsp vanilla extract
• 1 tsp kosher salt
• 1 cup finely chopped pecans
• 1 cup cornflakes, lightly crushed (optional)
• 1/2 packed cup brown sugar
• 1/2 cup all-purpose flour
• 1/4 cup unsalted butter, melted
• 2 cups mini marshmallows, plus more to taste.