01 -
Preheat the oven to 350°F (177°C). Line two standard muffin tins with paper liners or grease with nonstick spray.
02 -
In a large mixing bowl, whisk together the butter pecan cake mix, all-purpose flour, and baking powder until uniformly combined.
03 -
Add the mashed bananas and room temperature eggs to the dry mixture. Stir gently until just blended, taking care not to overmix.
04 -
Fold in 1 cup of chopped walnuts until evenly dispersed throughout the batter.
05 -
Scoop batter into prepared muffin liners, filling each cavity approximately two-thirds full for optimal rise.
06 -
Sprinkle the remaining 1/2 cup chopped walnuts evenly over the surface of the unbaked muffins.
07 -
Place pans in the center rack and bake for 17-20 minutes, or until muffins are golden brown and a toothpick inserted in the center comes out clean.
08 -
Allow muffins to cool in the tins for 5 minutes, then transfer to a cooling rack. Serve warm or at room temperature.