Recipe for Banana Chocolate Chip Muffins

Banana Chocolate Chip Muffins 

adapted from Banana Bread recipe of The New Best Recipe of Cook's Illustrated

2 cups (10 oz) all purp flour

3/4 cup sugar

3/4 tsp bkg soda

1/2 tsp salt

3 very ripe bananas (1.5 cups)

1/4 cup plain yogurt

2 large eggs

6 TBSP unsalted butter, melted and cooled

1 tsp vanilla

1/2 small bag mini chocolate chips