Chocolate Blood Orange Cupcakes

Preheat oven to 350ºF. Line standard muffin tins with paper liners; set aside.

For the cupcakes, sift together cocoa powder, flour, sugar, baking soda, baking powder, and salt into a large bowl. Add eggs, warm water, buttermilk, oil, and blood orange zest zest. Mix until smooth, about 3 minutes. Scrape down the sides and bottom of bowl to assure batter is well mixed.

Divide batter evenly among muffin cups, filling each 2/3 full. Bake until tops spring back when touched, about 20 minutes, rotating pan once if needed. Transfer to a wire rack; let cool completely.

For the frosting, beat butter and powdered sugar together until well-mixed. Add milk, the juice and the zest and beat on high until light and fluffy (3 or 4 minutes). If the frosting is too thick, add more milk, a little at a time, and beat until incorporated.

Frost cupcakes as desired.