How to Make It
Line the bottom of a 6-inch round cake pan with parchment paper; lightly coat pan with cooking spray. Whisk together flour, cinnamon, salt and baking soda in a medium bowl; set aside.
In separate medium bowl, whisk together mashed bananas, eggs, sugar, yogurt, oil and vanilla. Gently stir wet ingredients into flour mixture until well combined. Pour batter into prepared pan and sprinkle with walnuts.
Heat a 5.3-qt air fryer to 310°F and then place pan in air fryer and cook until browned and a wooden pick inserted in the middle comes out clean, 30 to 35 minutes, turning pan halfway through cook time. Transfer bread to a wire rack to cool in pan for 15 minutes before turning out and slicing.