Preheat oven to 200 degrees C. Lightly grease muffin tins or line with paper cases.
In a large bowl, mix the wholemeal flour, millet flour, baking powder, bicarb soda and salt. In a separate bowl, combine the buttermilk, egg, vegetable oil and honey. Stir buttermilk mixture into the flour mixture just until evenly moist. Transfer batter to the prepared muffin tins.
Bake 15 minutes or until a skewer inserted in the centre of a muffin comes out clean.