Start by preheating your oven to 350°F (175°C). This ensures that your muffins bake evenly and rise beautifully.
Line a 12-cup muffin tin with paper liners or lightly grease it with coconut oil to prevent sticking.
In a large mixing bowl, whisk together 1 cup of white whole wheat flour, baking powder, sea salt, and coconut sugar.
In a separate bowl, combine the Bulgarian-style buttermilk, Greek yogurt, melted coconut oil, egg, egg yolk, and vanilla extract. Whisk until smooth and well combined.
Pour the wet mixture into the dry ingredients. Using a spatula, gently fold the mixture together until just combined. Be careful not to overmix; a few lumps are okay!
Gently fold in the fresh blueberries, ensuring they are evenly distributed throughout the batter.
Spoon the batter into the prepared muffin tin, filling each cup about two-thirds of the way full.
Sprinkle a small amount of raw organic cane sugar over the tops of the muffins for a touch of sweetness and a lovely crunch.
Place the muffin tin in your preheated oven and bake for 18–20 minutes, or until a toothpick inserted into the center comes out clean.
Once baked, remove the muffins from the oven and let them cool in the pan for about 5 minutes before transferring them to a wire rack to cool completely.