Cook the unpeeled whole sweet potatoes in boiling water to cover for 20 to 30 minutes, until tender.
Slip off the skins and mash until smooth.
Add 1 tbsp [15 mL] butter, and remainder of ingredients except brown sugar. Beat until fluffy.
Turn the mixture into a buttered casserole. Melt 1 tbsp [15 mL] butter and brush on top. Sprinkle with brown sugar.
Bake in 450°F (230°C) oven for 35 minutes or until brown..
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