Banana Chocolate Bread

I really enjoy reading the book BakeWise by Shirley O. Corriher and there are tons of recipes that I want to try out. Most of the ones that I have tried out so far have been incredible so I was exited to try the banana bread recipe. As always I used coconut sugar instead of white sugar and I added 1 cup of chocolate chips because. The original recipe uses baking powder as well as baking soda, so I substituted the baking powder with more baking soda (not one to one as baking soda is 4 times more powerful).

1 3/4 cups of flour
1/2 tsp baking soda
1/2 tsp salt
1 1/2 cups coconut sugar
1/2 cups canola oil
1 tsp vanilla extract
2 eggs
1/2 cup buttermilk
4 mashed very ripe bananas (about 2 cups)
1 cup dark chocolate chips
1/2 cup whipping cream
Mix together flour, baking soda, salt and sugar.
In a second bowl, mix together canola oil, vanilla extract, eggs, buttermilk and bananas until well combined. Then add chocolate chips and roasted nuts.
Make a mold in the dry ingredients and add the banana mix.
In a third bowl whip the whipping cream until soft peaks form. Then fold the cream into the batter.
Bake in a 8 x 4.5 x 2.5 inch (20 x 11 x 6 cm) loaf pan at 375F / 190C for about 35 minutes until the center springs back when touched and a knife inserted in the center comes out clean.

As I didn't have a loaf pan I used an 8 x 8 inches square baking pan. The result was disastrous. After 35 minutes the batter was still very liquid and after another 30 hour the outside began to burn while a knife inserted in the center still came out smeared with uncooked batter.
So I took it out of the oven, cut it in half and tried saving it by frying it on the stove. The result looked very sad.
On the plus side it did taste quite good and was happily received as a sweet breakfast addition on our camping trip.

Next time I would still use my square baking pan but only make half of the batter. I don't know how all this batter can fit in a loaf pan and not overflow when it rises during baking!