To begin, in a small bowl add your milk and vinegar and stir them together. Set aside for several minutes for the milk to curdle and become "buttermilk."
Preheat a large pan (or skillet) to medium heat.
In a large mixing bowl, add your flour, oats, baking powder, baking soda and salt and stir them together.
In a small mixing bowl, add your coconut oil and maple syrup and whisk them together. Next, add your "buttermilk" and egg and whisk them in.
Pour your wet ingredients into your dry ingredients and whisk them together till smooth. If your batter is too thick, you can add another 1-2 tbsp of milk.
With large spoonfuls (about 1/4 cup), scoop the batter onto your hot pan, forming several pancakes. Cook each pancake on one side till you see bubbles forming, then flip them and cook them on the other side for a few more minutes, or till they're cooked through. Continue till all of your pancakes have been cooked.
Go crazy with toppings, and devour!
Stored in an airtight container in the fridge, these pancakes last about 5 days. They can also be frozen.