Position oven rack to the middle and pre-heat to 350 F. Line a 12-cup muffin pan with liners and set aside.
To a medium bowl, add flour, oats, flaxseed, baking powder, salt, and nuts. Whisk until combined and set aside.
To a large bowl, add mashed banana, cottage cheese, brown sugar, olive oil, milk, and vanilla extract. Whisk until mostly smooth.
Add dry ingredients to wet ingredients. Using a wooden spoon or spatula, mix until just combined. Don't stir too much or your muffins may be tough.
Scoop muffin batter into lined pan, filling each cup all the way up. Use a cookie scoop at this step to make things easier.
Bake for 25-30 minutes, or until the tops are lightly golden brown and set, and a toothpick inserted into the centre comes out mostly clean, with a few moist crumbs.
Let muffins cool in the pan for 5-minutes, and then transfer to a wire rack. Let them cool to room temperature before eating. Enjoy!
Serving: 1muffin, Calories: 198kcal, Carbohydrates: 29g, Protein: 6g, Fat: 7g, Saturated Fat: 1g, Polyunsaturated Fat: 2g, Monounsaturated Fat: 4g, Cholesterol: 2mg, Sodium: 252mg, Potassium: 233mg, Fiber: 3g, Sugar: 14g, Vitamin A: 43IU, Vitamin C: 2mg, Calcium: 87mg, Iron: 1mg