Heat oven to 375°. Grease and flour 12 muffin cups or 1 9 x 9 baking pan.
Mix cornmeal, flour, baking soda, baking powder, and salt in a bowl.
In another bowl, mix the sugar, egg replacer, plant-based milk, sweet potato, and coconut oil. Combine the two mixtures and stir until blended. Pour into baking pan or muffin cups (about 3/4 full or almost to the top for high top muffins).
Bake at 375° for 20 to 25 minutes.
Serve warm or at room temperature. Makes 12 muffins or one pan.