01 - Preheat oven to 400°F. Grease a 24-cup mini muffin tin with melted butter or nonstick spray.
02 - In a medium bowl, whisk together flour, sugar, baking powder, baking soda, and salt until well blended.
03 - In a separate bowl, whisk together buttermilk, egg, melted butter, and vanilla extract until smooth and fully incorporated.
04 - Pour wet ingredients into dry ingredients. Mix gently until just combined—do not overmix. Small lumps are acceptable and desirable for tender results.
05 - Gently fold in chocolate chips or blueberries if desired, distributing evenly throughout the batter.
06 - Spoon batter evenly into prepared mini muffin cups, filling each approximately 3/4 full to allow for rising.
07 - Bake for 8-10 minutes until tops are golden brown and a toothpick inserted into the center emerges clean.
08 - Let cool in pan for 2 minutes, then carefully remove. Serve warm with maple syrup, melted chocolate, or fruit preserves.