Preheat the Oven: Set your oven to 350°F (177°C) and grease a 9×5-inch metal loaf pan to ensure easy removal later.

Mix Dry Ingredients: In a bowl, whisk together all-purpose flour, baking soda, ground cinnamon, and salt.

Cream Butter and Sugars: In a mixer, cream the softened unsalted butter and granulated/brown sugars until smooth.

Incorporate Wet Ingredients: Blend in the eggs, mashed ripe bananas, Greek yogurt, and vanilla extract until well combined.

Combine Dry and Wet Ingredients: Gradually mix in the dry ingredients until just combined.

Prepare Cinnamon Sugar Swirl: In a small bowl, combine cinnamon and granulated sugar for the swirl. Layer half of the batter into the prepared pan, sprinkle the cinnamon-sugar mixture on top, and add the remaining batter.

Create Swirls: Use a knife to gently swirl through the batter, creating a beautiful marbling effect.

Bake the Bread: Place the loaf in the preheated oven and bake for 55–65 minutes, or until a toothpick inserted comes out clean.

Cool the Bread: Allow the bread to cool in the pan for one hour before transferring it to a wire rack.

Prepare the Icing: Mix confectioners’ sugar with heavy cream or milk until you reach your desired icing consistency.