Preheat the oven to 400ºF.
Grease a mini muffin tin and set aside.
In a large bowl, mix together the melted butter and sugar until well combined.
Mix in the egg, yogurt, baking soda, and baking powder, stirring until well combined.
Slowly mix in the flour until well combined.
Lastly, mix in the lemon juice and zest.
Scoop the batter into your mini muffin tin and bake 14-15 minutes.
Let cool before serving.