Preheat oven to 375℉. Line a 12-cup muffin tin with paper liners or spray with non-stick cooking spray.
In a large bowl, combine both whole-wheat flour and 3/4 cup all-purpose flour, wheat germ, baking powder, salt, and coconut sugar. Whisk together until incorporated.
Make a well in center of bowl and add the milk, oil, eggs, and vanilla. Gently mix until ingredients are just combined working out any pockets of flour.
In a small bowl, combine 1 tablespoon all-purpose flour and blueberries and shake to coat the blueberries. Spoon blueberries into the batter and gently fold in.
Divide batter into muffin tin evenly.
In a small bowl combine topping ingredients and mix together. Sprinkle evenly over muffin batter.
Bake for 20-22 minutes, rotating halfway through, or until a toothpick inserted in to the centers of muffins comes out clean.
Allow muffins to cool in pan for 5 minutes and then transfer muffins to a cooling rack and let cool completely.