Creating Blueberry Oatmeal Breakfast Bars is straightforward when you follow these steps:

1. Preheat Your Oven: Preheat your oven to 350°F (175°C) and line a baking dish (approximately 8×8 inches) with parchment paper.
2. Mix Dry Ingredients: In a large bowl, combine rolled oats, whole wheat flour, brown sugar, baking powder, baking soda, salt, and cinnamon. Mix these dry ingredients well.
3. Combine Wet Ingredients: In another bowl, whisk together applesauce, almond milk, and vanilla extract until smooth and well mixed.
4. Combine Mixtures: Gradually pour the wet ingredients into the dry ingredients, stirring until well combined. The mixture may be slightly thick.
5. Fold in Blueberries: Gently fold in the blueberries, ensuring they are evenly distributed throughout the batter. If you choose to add nuts, mix them in at this point.
6. Transfer to Baking Dish: Pour the batter into the prepared baking dish, smoothing it out evenly with a spatula.
7. Bake: Place the dish in the preheated oven and bake for 30-35 minutes or until the edges are golden and a toothpick inserted in the center comes out clean.
8. Cool: Remove from the oven and let the bars cool in the pan for 10-15 minutes before transferring to a wire rack to cool completely.
9. Slice: Once cooled, use a sharp knife to slice the bars into squares or rectangles as preferred.

These steps provide a clear guideline to create nutritious and delicious Blueberry Oatmeal Breakfast Bars.