Mix the dry ingredients in a bowl: flour, baking soda, baking powder, and sugar.
2½ cups flour, 1 tsp baking soda, 1 tsp baking powder, 1 cup sugar
In a separate bowl, mix together the yogurt and egg.
150 ml vanilla yogurt, 1 large egg
Melt unsalted butter in the microwave or over the stove in a pan.
⅓ cup unsalted butter
Preheat oven to 350F. Prepare your muffin sheets (you will need 2 of 6 or 12 muffins).
Add the dry ingredients with the liquid ingredients. Combine well together.
Add in the 100 ml of coffee. Mix all well.
100 ml espresso
Put the batter into the cupcake paper holders in the muffin pan.
In a pre-heated oven, bake the cupcakes for 15-20 minutes. Or when toothpick comes out clean when inserted.