Preheat your oven to 375°F (190°C).
In a mixing bowl, combine cornmeal, gluten-free flour, sugar, baking powder, and salt.
In another bowl, whisk together milk, vegetable oil, and egg.
Pour the wet ingredients into the dry ingredients and mix until just combined.
Pour the batter into a greased baking dish and bake for 20-25 minutes or until a toothpick comes out clean.
Let the cornbread cool completely, then cut it into cubes.
In a trifle bowl, layer the cornbread cubes, whipped cream, and fresh berries. Repeat layers until the bowl is filled.
Chill in the refrigerator for at least 1 hour before serving.