01 - Preheat oven to 400°F. Grease a 24-cup mini muffin tin thoroughly with melted butter or nonstick cooking spray to prevent sticking.
02 - In a medium mixing bowl, whisk together the all-purpose flour, granulated sugar, baking powder, baking soda, and salt until evenly distributed.
03 - In a separate bowl, whisk together the buttermilk, large egg, melted butter, and vanilla extract until the mixture is smooth and fully incorporated.
04 - Pour the wet ingredients into the dry ingredients. Mix gently with a spatula or spoon until just combined—do not overmix. Small lumps in the batter are acceptable and will result in tender poppers.
05 - Gently fold in chocolate chips or blueberries if desired, distributing them evenly throughout the batter.
06 - Spoon the batter evenly into the prepared mini muffin cups, filling each cup approximately 3/4 full to allow room for rising during baking.
07 - Bake for 8 to 10 minutes, or until the tops are golden brown and a toothpick inserted into the center of a popper comes out clean.
08 - Let the poppers cool in the tin for 2 minutes, then carefully remove them. Serve warm with maple syrup, melted chocolate, or fruit preserves for dipping.