Heat oven to 350F .
Grease bottom only of 8" square pan.
(To double use 9 x 13 pan).
Melt in 2-quart saucepan over low heat,
stirring constantly:
¼ cup ( ½ stick) butter
1 package (6 ounces) semisweet chocolate chips
Beat in thoroughly with a spoon:
¾ cup all purpose flour
½ tsp vanilla
1/3 cup sugar
¼ tsp baking powder
1/3 cup chopped walnuts
¼ tsp salt
1/3 cup mashed ripe banana (about 1 small)
1 egg
Spread batter evenly in pan.
Bake 30 minutes or until center is set;
cool completely. Cut into 2-inch squares.
16 brownies.
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