In a mixing bowl, whisk together the all purpose flour, whole wheat flour, collagen peptides and baking powder. Keep aside.
In a separate mixing bowl, add the egg, coconut oil, milk, sugar, yogurt and vanilla extract. Whisk everything together thoroughly.
Dump the dry mixture into this wet mixture and mix with a spatula until just combined. DO NOT over-mix!
Gently, fold the blueberries into this muffin batter.
Spray a cupcake tray with oil and use an ice cream scooper to distribute the batter into the pan. Each cavity should be about ¾ cup full.
Top off each muffin with a few additional blueberries.
Bake at 400 degrees for 5 minutes. Then, lower the temperature to 375 degrees and bake for another 15 minutes or until the muffins are golden brown.
Allow the muffins to cool down before removing them from the pan.
While they are cooling, prepare the lemon glaze. In a mixing bowl, mix together lemon juice, lemon zest and powdered sugar until you have a smooth and thick mixture.
Pour a bit of this glaze on top of each muffin and enjoy!
Notes
Leftovers can be stored in a sealed container at room temperature for up to 3 days.