Add the Kodiak Cakes mix, rolled oats, sweetener, baking powder, baking soda, and salt to a large bowl. Then, thoroughly mix these dry ingredients.
Mash the bananas in a separate large bowl. After that, add the eggs, unsweetened applesauce, vanilla extract, and almond milk. Whisk to combine these wet ingredients.
Gradually add the dry ingredients to the wet ingredients, stirring until just combined. Be careful not to over-mix, this helps keep the muffins light and fluffy!
Wash and dry the blackberries. Then, slice them in half lengthwise for better distribution in the muffins. Next, toss them gently with a spoonful of Kodiak Cakes or flour to prevent them from sinking to the bottom.
Gently fold the sliced blackberries into the muffin batter. You can also reserve a few for the top of the muffins for a nice garnish.
Lightly spray a non-stick muffin pan with oil or use parchment paper liners in a muffin tin. Divide the batter evenly among the muffin cups, forming about 16-18 muffins.
Bake the muffins at 350°F for 20-24 minutes, or until a toothpick inserted into the center comes out clean. Once done, let the muffins slightly cool and enjoy!