Preheat your oven to 425°F.
Line 6 cavities of a standard cupcake tin with paper liners, spreading them out so none are next to each other (see photo above). Set aside.
In a large bowl, combine the brown sugar with melted butter, milk, Greek yogurt, egg, and vanilla. Make sure any clumps of brown sugar are dissolved.
Add Kodiak mix, and mix until combined (do not overmix).
Fold ½ cup blueberries into batter, and reserve the remaining ¼ cup for adding on top of the muffins in step 7.
Pour batter into the 6 cupcake liners.
Top with remaining blueberries.
Sprinkle turbinado sugar on top of each muffin.
Bake at 425F for 5 minutes, then (without opening the oven door!) turn the temperature down to 350F. Bake for 12 minutes more, or until a toothpick inserted in the center of a muffin comes out clean.
Let cool in the pan for 10 minutes. Then run a silicone spatula around the muffin tops to release them from the pan, and cool on a wire cooling rack.