Heat the oven to 350°F. Grease a 9x5-inch loaf pan or line it with parchment.
Whisk the flour, cocoa, baking soda, baking powder, salt, and cinnamon in a bowl.
Cream the butter and brown sugar until light and fluffy. Beat in the eggs one at a time.
Mix in the mashed bananas, yogurt, and vanilla.
Add the dry mixture gradually and mix just until combined.
Fold in the chocolate chips, then gently fold in the raspberries.
Transfer the batter to the prepared pan.
Bake for about 60 to 70 minutes, until a toothpick comes out clean. Cool slightly before slicing.