Preheat your oven to 400℉.
Whisk together the cornmeal, flour, baking powder, baking soda, cinnamon, and salt.
In a large bowl, whisk together the melted and cooled butter, buttermilk, egg, and vanilla.
Add the dry ingredients into the wet ingredients and whisk to combine.
Distribute the batter between the lined wells of a muffin tin.
Add a heaping teaspoon of jam to the center of each muffin, followed by a sprinkle of turbinado sugar.
Bake for 15 minutes, or until a toothpick inserted into the center comes out clean.
Cool in the pan for 10 minutes before transferring to a rack to cool completely.