Preheat the oven to 350 degrees Fahrenheit.
Prepare two large sheet pans by spraying with cooking spray or lining them with parchment paper. Set aside.
Using a stand or hand mixer, beat together the salted butter and white sugar. Beat for 2-3 minutes to incorporate plenty of air. It should be light and fluffy.
Mix in the mashed ripe bananas, Greek yogurt, egg, and vanilla extract. Beat for 2-3 minutes again.
In a separate bowl, combine the all-purpose flour, cinnamon, baking soda, baking powder, salt, and nutmeg. Stir well.
On low speed, add the flour mixture into the batter until just barely combined.
Use a cookie scooper to scoop two-inch balls of dough onto the sheet pan (I used a 2-inch cooking scoop for this step). Leave two inches between each cookie.
Bake cookies in the oven for 10-12 minutes or until cookies have puffed up and the edges are lightly golden. Plate and serve.
Calories: 158kcal | Carbohydrates: 22g | Protein: 2g | Fat: 7g | Saturated Fat: 4g | Trans Fat: 1g | Cholesterol: 18mg | Sodium: 110mg | Potassium: 93mg | Fiber: 1g | Sugar: 12g | Vitamin A: 136IU | Vitamin C: 1mg | Calcium: 16mg | Iron: 1mg