Preheat your oven to 350° F and prepare your muffin pan with paper liners.
In a large bowl, combine flour with other dry ingredients.
In a medium bowl, combine your wet ingredients.
Add the wet ingredients to the dry ingredients in the large mixing bowl and mix your sweet potato muffin batter.
Spoon batter into prepared muffin pan with muffin liners.
Mix streusel topping in a small bowl and sprinkle over muffins. Bake for 25 minutes at 350 F.
Cool in the muffin tin on a wire rack for five minutes, then remove the muffins. Let them sit on the cooling rack for about 15 minutes. Then enjoy with a cup of coffee or tea.