Preheat oven to 350F. Line a standard muffin tin with parchment muffin cups.
In a large bowl, add the mashed banana (or mash it in the bowl), tahini, maple syrup (if using), olive oil, vanilla, and eggs. Whisk until smooth.
In a high-speed blender, add your nuts and/or seeds and blend it into a coarse meal, scraping under the blade as needed. Transfer to the bowl along with the oats, cinnamon, baking soda, and salt. Stir to thoroughly combine, then fold in the blueberries.
Divide the batter between the muffin cups, filling them just below the brim. Bake for 30-35 minutes or until golden brown on top and cooked all the way through. Let cool for at least 15 minutes.