Preheat your oven to 400°F (200°C).
Grease your mini muffin tin with vegetable oil or cooking spray.
In a large mixing bowl, combine the cornmeal, gluten-free all-purpose flour, baking powder, salt, and granulated sugar. Mix thoroughly.
In another bowl, whisk together the milk, vegetable oil, and eggs until fully combined.
Pour the wet ingredients into the dry ingredients and gently stir until just combined.
Fill each muffin cup about 2/3 full with the batter.
Bake for 12-15 minutes until golden brown and a toothpick comes out clean.
Let the muffins cool for about 5 minutes before transferring to a wire rack.