Begin by mashing ripe bananas in a bowl until they're smooth and creamy. These will add natural sweetness and moisture to your bread.
Toss fresh blueberries in a bit of flour. This prevents them from sinking to the bottom of the bread while baking.
In a separate bowl, whisk together flour, baking powder, baking soda, salt, and ground cinnamon. This ensures even distribution of leavening agents and spices.
Cream softened unsalted butter and granulated sugar together until light and fluffy. This adds richness and sweetness to your bread.
Beat in eggs one at a time, followed by pure vanilla extract. These ingredients provide structure and flavor.
Gradually add the dry ingredient mixture to the wet ingredients, alternating with Greek yogurt (or sour cream)
Gently fold in the mashed bananas and floured blueberries into the batter. Be careful not to overmix; you want those juicy blueberries to stay whole.