Step 1: Preheat your oven to 375°F (190°C) and line your muffin tin with parchment paper or muffin liners.
Step 2: In a large mixing bowl, whisk together the white whole wheat flour, old-fashioned rolled oats, light brown sugar, baking powder, ground cinnamon, and kosher salt until well combined.
Step 3: In another bowl, whisk together the nonfat milk, melted butter, eggs, and vanilla extract until smooth.
Step 4: Pour the wet mixture into the dry ingredients, stirring gently until just combined. Be careful not to overmix.
Step 5: Gently fold in the blueberries, being cautious not to break them.
Step 6: Spoon the batter evenly into the prepared muffin tin, filling each cup about ¾ full.
Step 7: Bake in the preheated oven for 18-20 minutes, or until a toothpick comes out clean.
Step 8: Allow the muffins to cool in the tin for about 5 minutes before transferring them to a wire rack to cool completely.