Preheat oven to 325 degrees F.
Grease muffin tins with coconut oil.
Make the vegan "buttermilk:" Place the oat milk and the apple cider vinegar into a small bowl and set aside.
In a medium bowl, whisk together gluten-free flour, cornmeal, corn flower, baking powder, baking soda, xanthan gum and salt.
Add liquefied coconut oil, agave nectar, applesauce and vanilla and stir until incorporated.
Add vegan "buttermilk," and stir gently until a grainy, sticky dough forms.
Fold in raspberries until they're evenly distributed throughout the batter.
Scoop batter into muffin tin, sprinkle the tops with a bit of sugar, then place in the oven.
Bake for 10 minutes, then rotate the tin 180-degrees and bake for another 5 minutes or until the tops are springy and a toothpick inserted into the middle of a muffin comes out clean.