Generously butter an 8 x 5 bread pan. Set the oven to preheat to 350℉.
Place the whole oats in a small food processor and process briefly to break down a bit - if using quick oats, this isn't necessary.
To a mixing bowl, add the oats from step one, plus the flour, granulated sugar, baking soda, baking powder, salt and cinnamon. Use a whisk to completely combine the dry ingredients.
In a measuring cup, or small bowl, add the egg and stir with a fork to break up, Mix in the yogurt, oil and honey and stir to combine completely.
Pour the wet ingredients into the dry ingredients. Use a large spoon, or rubber spatual to fold the two mixtures together. The batter will be rough, with a few small spots of white showing here and there.
Scrape the batter into the prepared loaf pan and even out the top. Scatter a few whole oats over the top.
Bake in the oven, preheat to 350℉ for about 50 minutes. A toothpick or wooden skewer inserted near the center should come out clean, with perhaps only a few moist crumbs sticking to it. [make sure you haven't hit a piece of banana if the toothpick seems wet]
Remove the bread from the oven and set on a cooling rack for about 5 minutes. Run a dull knife around the edges of the pan to loosen the bread, and remove it, placing it on the cooling rack to cool further.
Serve with some butter and/or honey. It is very good toasted.
Notes
Banana Oat Bread can be stored, wrapped tightly, in the refrigerator for up to a week. Bring back to room temperature for serving, or toast the slices.