01 -
Heat oven to 375°F. Grease a 9x13 inch pan.
02 -
Mix sugar and butter until fluffy.
03 -
Beat in the yogurt and eggs.
04 -
Mix in the mashed bananas and vanilla.
05 -
Add flour, baking soda, and salt. Mix just until wet. Add nuts if desired.
06 -
Pour the batter into the prepared pan.
07 -
Bake for 23-28 minutes until a toothpick comes out clean.
08 -
Heat butter in a pan until it is light brown.
09 -
Remove from heat quickly to avoid burning. Mix in powdered sugar, vanilla, and milk until smooth.
10 -
Pour frosting onto warm bars and spread with a spoon.