Oven & Pan Prep
Preheat your oven to 350°F (175°C). Thoroughly grease a standard
9×5 inch loaf pan, or line it with parchment paper for effortless
removal.
Combine Wet Ingredients
In a large bowl, mix together the melted butter and white sugar.
Add the eggs, vanilla extract, and lemon juice. Whisk until fully
combined and smooth.
The Flour Separation (Critical Step)
Measure out your 1 3/4 cups of flour. Remove **2 tablespoons** of
that flour and place it into a small bowl with the blueberries. Toss
gently until the berries are completely coated. This layer prevents
them from sinking to the bottom of the pan.
Sift & Incorporate Dry Base
In a separate bowl, whisk together the remaining flour, baking
soda, baking powder, and salt. Pour the dry ingredients into the
wet butter mixture and mix gently until just combined.
Fold the Heavy Elements
Mash your bananas with a fork. Gently fold the mashed bananas,
sour cream, chopped walnuts, and the flour-coated blueberries
into the batter until evenly distributed. Do not over-mix.
Bake to Perfection
Spread the batter evenly into your prepared 9×5 inch loaf pan.
Bake at 350°F for **60 to 70 minutes**. Because of the extra
moisture from the blueberries, it may take 5 to 10 minutes longer
than a standard loaf. Test with a toothpick in the absolute center.
Cool Thoroughly
Remove from the oven and let the bread cool inside the pan for 10
minutes. Then, turn it out onto a wire rack to cool completely
before slicing.
BAKING BEST PRACTICE: Keep an eye on the loaf around the
45-minute mark. If the top crust is beautifully golden brown but
the center isn’t fully cooked yet, loosely tent a sheet of aluminum
foil over the top of the pan to prevent over-browning while it
finishes baking.