First, set your oven to 350 degrees Fahrenheit. While that’s heating up, grease a muffin tin with butter or cooking spray or line it with muffin liners. Greasing is optional, especially if you’re using liners—your choice!

In a large bowl, combine the whole wheat flour, old-fashioned oats, baking soda, ground cinnamon, and salt. Give them a gentle stir to ensure everything is evenly distributed. Set this bowl aside for now.

In another spacious bowl, beat together the mashed bananas, eggs, honey (or maple syrup), olive oil, milk, and vanilla extract. Whisk until everything is blended smoothly, and you see that beautiful banana mash blending in.

Now, gently pour the dry ingredients into the wet mixture. Stir until just combined. Be careful not to over-mix; this will keep your muffins light and fluffy. If you're using the optional chopped nuts or mini chocolate chips, this is the moment to fold them in!

Spoon the muffin batter evenly into your prepared muffin cups. Fill them about two-thirds full to allow for lovely muffin tops. To add a little flair, sprinkle some extra oats on top along with a little dusting of cinnamon – who doesn’t love a bit of visual appeal?

Slide those beauties into your preheated oven and bake for 20 to 25 minutes. You’ll know they’re done when a toothpick inserted into the center comes out clean. The aroma wafting through your kitchen will be irresistible!