Method:
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Preheat the oven to 180C and line a 12-cup muffin tin with muffin liners.
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In a medium bowl, combine flour, almond flour, 1/4 cup of granulated sugar, 3/4 teaspoon of cinnamon, ground nutmeg, baking powder, and salt. Stir or whisk to blend thoroughly; set aside.
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In a large mixing bowl, whisk the eggs, brown sugar, milk, coconut oil, and vanilla extract. Add the sweet potato puree and whisk until well blended.
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With a spatula, stir the flour mixture into the sweet potato batter just until the dry mixture is moistened. The batter will be a bit lumpy.
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Fold in the nuts and chocolate , if using.
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Fill muffin cups to 3/4 of their capacity.
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Combine the 2 tablespoons of granulated sugar with 1/2 teaspoon of cinnamon.
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Sprinkle about 1/2 teaspoon of the cinnamon-sugar mixture over the top of each muffin.
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Bake the sweet potato muffins for 20 to 26 minutes, or until a toothpick comes out. clean when inserted into the centre of a muffin.