Super simple and super tasty recipe!
Mix together baking soda and buttermilk and set aside.
Cream together butter and sugar.
Add in eggs and mix well.
Add in flour and mix well.
Add in buttermilk mixture and orange zest, mix until well combined.
Fill muffin cups about 2/3 full.
Bake at 375 for 12-15 minutes. I left the mini muffins in for 12 minutes, full size muffins in for 15 minutes. The original recipe says it yields 3 dozen mini muffins, but I got a bit more than that.
*For variations, try adding pineapple juice to the brown sugar, or 1/2 tsp lemon extract to the muffin batter. Your choice!