In a medium bowl, mix together flour, baking soda, sea salt and cinnamon. Set aside.
In a large bowl, mash bananas.
Add melted butter and vanilla and stir until combined.
Add sugar and stir until dissolved.
Add eggs and sour cream and stir until combined.
Add milk and gently mix until combined.
Add dry ingredients and stir until the mixture is homogenous (uniform throughout) and there are no lumps.
Pour batter into prepared pan.
Bake in preheated oven for 35-45 minutes or until a toothpick comes out clean.
Let the cake cool to room temperature.
Make the frosting:
While the cake is baking, make the cream cheese frosting.
Beat together butter and cream cheese until smooth.
Add vanilla and 2 cups of powdered sugar and beat (starting on low speed and increasing to medium-high) until smooth.
Add up to ½ cup more powdered sugar until you reach a spreadable, but thick consistency.
Putting it together:
When the cake is cooled, spread frosting evenly over the top.
Chill for at least 3 hours, or overnight. Then serve cold or at room temperature.
Banana Cake: Ingredient Substitutions
As always, let's chat about the ingredients in this easy banana cake recipe.
All-purpose flour. Cake flour can be used in place of all-purpose flour for a slightly lighter texture. Bread flour and pastry flour also work well!
Salted butter. Unsalted butter works perfectly in this banana cake recipe. You just may need to increase the amount of sea salt. You can also substitute up to half of the butter with canola oil or applesauce with great results!
Granulated sugar. I found that granulated sugar yielded the lightest, fluffiest cake. You can replace up to 1/2 cup of the white sugar with brown sugar for a little bit of a richer flavor!
Sour Cream. Greek yogurt can be used in place of sour cream with great results!
Whole Milk. 2% milk can be used in place of whole milk, but I would avoid skim and fat-free milk, because the fat is necessary for the best texture.
NOTE: you can substitute both the sour cream and whole milk with 1 1/2 cups of buttermilk. I just never have it on hand so I chose to create a recipe without relying on it!