01 -
Place oats and buttermilk in a medium bowl and let soak for 10 minutes to help soften the oats.
02 -
Preheat oven to 400 degrees F (200 degrees C).
03 -
In a separate medium-sized bowl, sift together the flour, baking soda, salt, baking powder, and cinnamon. Set aside.
04 -
To the bowl with the oats, add the egg, vegetable oil, vanilla extract, and brown sugar. Whisk to combine.
05 -
Gradually add the flour mixture to the wet ingredients, stirring with a whisk just until combined. Avoid overmixing.
06 -
Gently fold in the blueberries and chopped walnuts.
07 -
Spray a 12-cavity muffin top pan or regular muffin pan with non-stick spray. Fill the cavities with the batter and bake for 20 minutes.
08 -
Let the baked muffin tops cool in the pan for 5-10 minutes before transferring them to a wire rack. Enjoy!