Preheat the oven to 350F.
Add the butter, brown sugar, bananas, tahini, greek yogurt, eggs, and vanilla extract to a bowl. Mash the bananas into the wet ingredients and stir until combined.
Add the flour, cinnamon, baking soda, baking powder, and salt. Gently mix until just combined.
Transfer the batter to a 9x5 inch loaf pan that is greased and lined with parchment paper.
Drizzle some tahini on top of the loaf and sprinkle on the turbinado sugar and sesame seeds (optional).
Transfer to the oven and bake for 40-55 minutes, until an inserted toothpick comes out clean.
Let it cool, slice, and enjoy! I love top each slice with salted butter, honey, and flaky salt.