Preheat oven to 350°F and generously grease a mini muffin pan.
In a bowl, stir together brown sugar, flour, and chopped pecans.
In another bowl, mix melted butter and eggs until smooth.
Combine wet ingredients into dry and stir just until mixed.
Spoon batter into muffin cups, filling each about ⅔ full.
Bake 15–20 minutes until lightly golden and set in the center.
Remove muffins from pan while still warm and let cool on a rack.
