Sweet Potato Citrus Cupcakes

2 leftover baked sweet potatoes and a box of lemon cake mix were my inspiration for these light and airy cupcakes. You can frost them as much or as little as you would like. I prefer just a little because I don't think that they need much, but the frosting recipe makes enough that you can add more if you wish. Without frosting, they would be great as breakfast/brunch muffins.
Simple to make, the sweet potato makes them moist enough that you don't even need to use any oil.

1 18.25 oz box lemon cake mix
1 1/3 cups orange juice
1 1/2 cups baked sweet potatoes, mashed (about 2 medium sweet potatoes)
3 eggs

Frosting:
1 8 oz package cream cheese (softened)
5 cups confectioners sugar

2 tbsp orange zest (optional for garnish)

Preheat oven to 350. Line two 12 cup muffin tins with paper liners. Combine cake mix, orange juice, sweet potatoes and eggs in mixer bowl. Beat for 30 seconds on low, then 2 minutes on medium.
Spoon equal amounts batter into muffin cups.Bake for 18-22 minutes or until pick inserted in center comes out clean. Let cool for 15 minutes then frost as desired.
To make frosting - combine cream cheese and sugar in mixer bowl, beat on low until combined.