Begin by mixing the flour, the 1/2 Tbsp of cinnamon, salt and baking soda in a bowl and set aside.
2 cup (240g) all-purpose flour, 1/2 Tbsp cinnamon, 1/4 tsp salt, 1/2 tsp baking soda
Using a flat beater, cream the butter with the brown sugar and 1/2 cup of granulated sugar. Add in the eggs and vanilla and beat everything until they're well combined.
1/2 cup (113g) unsalted butter, 1/2 cup (100g) light brown sugar, 1/2 cup (100g) granulated sugar, 2 large eggs, 1 tsp vanilla extract
With the mixer on low speed, add in the dry ingredients and mashed bananas and mix just until the flour is incorporated. Refrigerate the dough for about 30 minutes.
2 medium (200g) ripe bananas
Using a small ice cream scooper, scoop 20 cookies onto a lined cookie sheet and refrigerate for at least 1 hour.
Preheat the oven to 350F/177C convection (325F/163C conventional) and mix 1 tsp of cinnamon and 1/2 cup sugar and roll the cookie scoops in the cinnamon sugar.
Separate the cookies onto three pans, allowing 6-7 cookies per pan. Roll them into a ball and then flatten them into a patty. Not super thin, just press down on the center a little.
Toss the cookies in the cinnamon sugar and bake for 12 minutes.
Allow the cookies to cool on the pan for a 2-3 minutes and then move them to a cooling rack to cool completely before icing.