Banana Cornbread Mug Cake

butter or coconut oil (melted)

coconut buttermilk (add 1/2 t. apple cider vinegar to a measuring cup and then add enough coconut milk to equal 1/4 cup; let stand 5 minutes)

egg (lightly beaten)

banana (mashed)

cornmeal flour (grind polenta or cornmeal in a coffee grinder for a finer texture, or you can buy corn flour)

rolled oats (ground into flour)

chia seeds

salt

baking soda