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Crazy Banana Cake

Crazy banana cake is a light, airy wacky-style banana sheet cake made in one bowl without eggs or dairy. The spongy crumb bakes up tender and then soaks up a smooth chocolate glaze for a simple, sliceable finish.
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Prep Time 15 minutes
Cook Time 30 minutes
Total Time 45 minutes
Servings: 12 servings
Course: Dessert
Cuisine: American
Calories: 340
Ingredients Equipment Method Notes

Ingredients
  

  • 3 ripe bananas Mash until mostly smooth.
  • 1.5 cup all-purpose flour
  • 1 cup sugar
  • 1 tsp baking soda
  • 0.5 tsp salt
  • 1 tsp cinnamon
  • 0.3333333333 cup vegetable oil
  • 1 tbsp apple cider vinegar
  • 1 tsp vanilla extract
  • 0.5 cup water
For the chocolate glaze
  • 1 cup powdered sugar
  • 3 tbsp cocoa powder
  • 3 tbsp milk
  • 0.5 tsp vanilla

Equipment

  • 1 sheet pan

Method
 

Prep and mix
  1. Preheat the oven to 350°F and grease a 9x13 pan. Make sure the pan is ready so the batter goes in right away.
  2. Mix the flour, sugar, baking soda, salt, and cinnamon directly in the pan. Spread the dry ingredients evenly for consistent baking.
  3. Make three wells in the flour and add the vegetable oil, apple cider vinegar, and vanilla extract to each well. Keep the wells separate so the liquids absorb quickly.
  4. Pour the mashed bananas and water over everything, then stir with a fork until just combined. Stop as soon as there are no dry pockets and the batter looks slightly lumpy.
Bake and glaze
  1. Bake at 350°F for 25–30 minutes until a toothpick comes out clean, without overbaking. Look for a lightly golden top and set center.
  2. Whisk the glaze ingredients until smooth, then pour it over the warm cake. The glaze should flow across the surface and soak in while the cake is hot.

Notes

For the spongiest crumb, mix only until the batter is just combined—overstirring can make it denser. Store covered at room temperature up to 2 days or refrigerate up to 5 days; freeze slices up to 2 months (thaw overnight in the fridge). For a dairy-free swap, use a dairy-free milk alternative in the chocolate glaze.