Preheat the oven to a 350°F. Butter or spray a 9x5 loaf pan. Line a parchment paper with the loaf pan for easier take-out once the bread is baked. In a small bowl, place 4 oz unsalted butter, cover with plastic food wrap and microwave on 40-60 seconds to melt. Set aside to cool. In a large bowl, mash 1 banana with a fork. Add 1/2 cup sugar, 4 oz melted butter, 1/2 cup sour cream, 1 tbsp freshly squeezed orange juice, 1/2 medium orange zest, 1 tsp vanilla extract and 1 large egg. Whisk to combine.
In a separate bowl, sift and whisk, 1 1/2 cups all-purpose flour, 1 tsp baking soda and 1/2 tsp fine salt. Slowly stir in the flour mixture with a spatula into the batter, until ‘just combined’ – do not overmix!
In a medium bowl, combine and toss together 2 tbsps all-purpose flour, 1 cup fresh blueberries and 1 cup fresh raspberries. Gently stir the berries into the batter. You don’t want the berries to let out their juices. The batter will be very thick.
Pour the batter into prepared loaf pan and gently go over with a spatula to spread evenly throughout the pan. Bake the bread for 50 minutes or until a wooden pick inserted in center comes out clean. Grab the parchment paper on both sides (without burning yourself), and slowly take out the bread onto the cooling rack. Allow bread to cool completely before slicing. Bread stays fresh for up to 3 days at room temperature.
This bread is perfect for guests or with a warm cup of tea or coffee early morning or afternoon.