Heat oven to 350 degrees F. Lightly grease a 9 inch square pan with oil.
In a medium bowl, mix together the gluten free flour blend, baking soda, and sea salt. Set aside.
In a separate bowl, mix together the organic canola oil, granulated sugar, and brown sugar.
Add eggs, mashed bananas and vanilla extract, stirring until well blended. Mix in the dry ingredients and any nuts or chocolate chips if using.
Pour batter into the baking pan and bake for approximately 35 minutes at 350 degrees F.
Let the cake cool fully, then make the cream cheese frosting.
Beat the cream cheese and butter until fluffy. Mix in the vanilla, then gradually add the confectioners' sugar while continuing to mix.
Spread cream cheese frosting over the cooled cake. Store cake in the refrigerator.
Notes
If you need to make this egg free, use ⅓ cup unsweetened applesauce in place of the eggs.Store leftover cake in the refrigerator. It should stay fresh for about 5 days.You could also freeze this cake. Wrap the entire cake or individual slices in plastic wrap and then foil. Store in the freezer for up to 3 months.