Boston Market Sweet Potato Casserole recipe - from the The DuBose Family Family Cookbook

Ingredients

• 6 cups mashed sweet potatoes (5 to 6 potatoes-see step #1)
• 3/4 cup dark brown sugar
• 1/2 cup heavy cream
• 1/4 cup melted butter
• 1/4 teaspoon cinnamon
• 1/4 teaspoon salt
• 2 cups mini marshmallows
• Oatmeal Streusel:
• 1/2 cup rolled oats
• 4 tablespoons dark brown sugar
• 2 tablespoon all-purpose flour
• 1/4 teaspoon ground cinnamon
• 4 tablespoons cold butter