Preheat oven to 350. Spray loaf pan with baking spray.
Cream butter & sugar until fluffy.
Sift flour, soda and cocoa powder into mixture.
Add eggs one at a time and beat well for each.
Add yogurt, mashed bananas, and vanilla blending until well combined.
Fold in chocolate chips.
Pour batter into prepared loaf pan.
Bake for 30-40 minutes until a toothpick comes out clean.
Run a thin knife along the edge to ensure loosens from pan and allow to cool a few minutes in the pan. Turn out onto a cooling rack and allow to cool completely.
Top with glaze and sliced oranges.