Preheat oven to 350 degrees (F). Generously grease a 9x5 inch loaf pan; set aside.
In a large bowl whisk together the melted butter and sugars. Add the eggs one at a time and then the vanilla; beat well.
In a small bowl combine the flour, baking soda and salt; stir into the wet mixture until smooth.
Fold in the yogurt and mashed bananas. Set aside.
In a small bowl combine the sugar and cinnamon; set aside.
Spread half of the batter evenly into the prepared pan, sprinkle cinnamon sugar mixture on top, then add remaining batter, smooth the top.
Bake in preheated oven for 60 minutes, or until a toothpick inserted into the center of the loaf comes out clean.
Cool loaf in the pan for 10 minutes before removing to a wire rack to cool completely.
While the cake is cooling, make your butterscotch glaze...
Place the butterscotch chips and oil in a small microwaveable bowl. Heat on medium-powder in 15 second increments, stirring in between, until completely melted.
Drizzle glaze over cake and allow it to set. Cut into slices and serve!
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