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Preheat oven to 350 degrees F. Grease 8-½ x 4-½-inch loaf pan and line pan, including up the sides, with parchment paper.
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In mixing bowl, whisk together flour, baking soda, baking powder, salt and spices until no clumps remain.
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In large mixing bowl, or in bowl of stand mixer fitted with whisk attachment, mix softened butter and brown sugar for 3-4 minutes. (Note: The mixture won't cream together, and this is okay.)
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To same large mixing bowl, add sweet potato puree, maple syrup, vanilla extract and almond extract. Mix until smooth. (Note: The mixture will look a little clumpy, but comes together at the end.)
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Add one egg and mix until completely combined before adding second egg.
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Mix in sour cream, then carefully fold in flour mixture until combined. (Note: A few streaks of flour in the mixture can remain. Do not overmix.)
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Into loaf pan, pour batter and smooth out top with rubber spatula. Bake 65-75 minutes, or until wooden skewer comes out with a few moist crumbs. Let cool in pan about 10 minutes, then remove from pan and cool completely on wire rack before glazing.