Preheat your oven to 325 degrees F. Grease a 9" x 5" loaf pan with butter and generously dust the bottom and edges of the pan with spelt flour.
Using a stand mixer and whisk attachment or large bowl and hand whisk, beat the oil and honey together. Beat in the eggs one at a time and then add the mashed banana, milk and vanilla extract. Whisk to combine.
In another bowl, mix together the flour, flax, baking soda, baking powder and salt. Gently fold in the chocolate chips or other additions. Add the dry ingredients to the wet ingredients and fold together with a large spatula until just combined.
Pour the batter into your greased and floured loaf pan and bake for 55 to 60 minutes, or until a toothpick inserted into the centre comes out clean. Let the bread cool in the pan for at least 10 minutes then transfer it to a wire rack to cool more before slicing.
Update: March 20, 2020
After finding a delicious rendition of banana bread in Carla Bartolucci's book Einkorn, Recipes for Nature's Original Wheat, I was inspired to put a twist on my whole grain spelt banana bread recipe.
Whole Grain Einkorn Banana Bread (with Caramelized Bananas)
In a medium skillet, melt the coconut oil, then add the bananas and brown sugar. Stir to combine and bring to a simmer on medium-low heat. Continue simmering for 5 minutes or until bananas have softened and the sugar begins to caramelize. Remove from the heat and allow to cool.
Continue with the rest of ingredients (reduce honey to 1/4 cup) and instructions listed above.