Preheat the oven to 375℉/190℃. Line a muffin tin with liners and set aside. Melt the butter and allow it to cool.
1/3 cup unsalted butter
In a bowl, add the flour, cornmeal, baking soda, baking powder, cornstarch, cinnamon, and salt. Stir together and set aside.
1 2/3 cups all-purpose flour, 2 tsp baking powder, 1 tsp baking soda, 3/4 cups fine grind cornmeal*, 1/4 tsp cinnamon, 1/4 tsp salt, 1 tbsp cornstarch
In a large bowl, add the white sugar and lemon zest. Rub between your fingers for a minute and combine, the aroma of lemon will fill the air.
3/4 cups white sugar*, 1 tsp lemon zest
Into the same bowl, add eggs, vanilla, butter, oil, and yogurt. Whisk together for 2 minutes until well combined.
1/3 cup oil, 1/3 cup unsalted butter, 1 cup yogurt, 2 large eggs, 1 tbsp vanilla
Combine the dry and wet ingredients with a spatula gently until a soft muffin batter forms, do not over-mix!
Toss the washed and lightly dried blueberries in flour and evenly coat them. The flour sticks better if the blueberries are a bit wet. This will prevent them from sinking as they bake.
1 1/2 cup blueberries
Add them into the batter and mix until just combined, don't over-mix.
Evenly scoop and divide the batter between the liners. Add extra blueberries and sprinkle a bit of white sugar on top of each liner (optional).
Bake for 24-28 minutes or until a toothpick inserted comes out clean.
Allow to cool, and enjoy!