Banana rhubarb bread

110g (1 stick) unsalted butter, at room temperature, plus more for pan

4dl all-purpose flour, plus more for pan

3 medium very ripe bananas (about 13 ounces), peeled and mashed

1dl natural yogurt 

1 teaspoon vanilla extract

1 teaspoon baking powder

1/2 teaspoon baking soda

1/2 teaspoon kosher salt

2,5dl sugar

1tbs dark syrup

2 large eggs, at room temperature

 chopped toasted and salted cashews 

Recipe(made some modifications)  and instructions here:

http://www.epicurious.com/recipes/food/views/our-favorite-banana-bread-56389378?intcid=inline_amp