01 -
Preheat oven to 400°F. Line a 12-cup muffin tin with paper liners and set aside
02 -
In a large bowl, sift together flour, baking powder, nutmeg, cinnamon, and salt; set aside
03 -
In another large bowl, whisk together melted butter, both sugars, eggs, vanilla extract, sour cream, and mashed bananas until fully incorporated
04 -
Add dry ingredients to wet ingredients and, using a rubber spatula, mix until just combined. Do not over mix
05 -
Fold in blueberries and walnuts, mixing just until combined
06 -
Divide batter evenly among prepared muffin cups, filling each all the way to the top
07 -
Press a few extra blueberries into the top of each muffin and sprinkle with sparkling sugar, if using
08 -
Bake in center of middle rack for 24-26 minutes, until tops are puffed up and golden brown, and a toothpick inserted comes out clean or with few moist crumbs
09 -
Cool muffins at least 15 minutes in the pan before serving warm or transferring to a cooling rack