Preheat oven to 350°F (175°C) and grease a mini muffin pan.
In a bowl, whisk flour, sugar, baking powder, baking soda, and salt.
In another bowl, mix egg, buttermilk, vanilla, and melted butter.
Combine wet and dry ingredients, stirring until just mixed.
Fold in chocolate chips or blueberries if using.
Spoon batter into mini muffin cups, filling each halfway.
Bake for 10-12 minutes until golden and cooked through.
Cool slightly before removing from the pan.
For the glaze, whisk powdered sugar, maple syrup, and milk until smooth.
Drizzle glaze over poppers and serve warm.