Pre heat the oven to 350 degrees F. Spray a 12 cup bundt pan with non stick baking spray. Using a fine pastry brush, spread the baking spray to coat the pan making sure to get into all the nooks and crannies. Set aside.
In a large bowl, sift together the all purpose flour, baking powder, baking soda, and spices. Whisk in the kosher salt. Set aside.
3 (375 g) cups All purpose flour, 1 ½ teaspoon Baking powder, 1 teaspoon Baking soda, 1 ¾ teaspoon Ground cinnamon, ½ teaspoon Ground ginger, ½ teaspoon Ground nutmeg, ¼ teaspoon Ground allspice, ⅛ teaspoon Ground clove, ½ teaspoon Kosher salt
In a small bowl, mash the bananas with the back of a fork. Be sure to leave some small chunks of banana behind. Stir in lemon juice. Set aside.
1 ½ (341 g) cup Mashed bananas, 1 teaspoon Lemon juice
In the bowl of a stand mixer, fitted with the paddle attachment, beat butter and both sugars on medium low speed until combined. Stop to scrape the sides and bottom of the bowl as needed with a rubber spatula. Increase speed to medium and continue to beat until pale and fluffy, about 4 to 5 minutes.
¾ (170 g) cup Unsalted butter, 1 (220 g) cup Light brown sugar, ½ (100 g) cup Granulated sugar
Add eggs, one at a time, beating well after each addition, and vanilla extract. Beat on medium high speed until combined.
3 large Eggs, 1 tablespoon Vanilla extract
Beat in mashed banana. The mixture may appear curdled but that's ok. It will smooth out.
With the mixer on low speed, add flour mixture in three additions alternating with the buttermilk (in two additions), beginning and ending with the flour mixture. Mix each addition until just combined, scraping down the sides of the bowl as necessary. Be careful not to over mix.
¾ (180 g ) cup Buttermilk
Spoon batter into the prepared pan and smooth the top with the back of a spoon or offset spatula. Place a kitchen towel on the counter and firmly tap the pan on top of the towel to release any air bubbles.
Bake for 65 to 75 minutes (loosely cover the cake with foil after 30 minutes of baking to help prevent over browning) until a toothpick inserted into the center comes out clean with a few moist crumbs and the cake springs back to touch. Cool the cake in the pan on a wire rack for 10 minutes. Then, invert the cake onto the wire rack to cool completely.