Step 1

Preheat a waffle iron.

Step 2

In a medium bowl, mix together the milk and vinegar. Allow to sit aside for about 5 minutes.

Step 3

In the meantime, in a small bowl, melt the butter in the microwave until it is just about melted (about 30-45 seconds). Whisk in the maple syrup while it is still warm. Mix in the vanilla.

Step 4

In a large bowl, mix together the flour, oats, baking powder and salt. Make a well in the dry ingredients, and slowly add in the milk mixture and the butter mixture. Whisk together until everything is mixed and the batter has come together.

Step 5

Pour or scoop the waffle batter into a hot waffle iron (I used a ¼ cup measuring cup for each waffle, but waffle makers vary). Cook waffles for about 4 minutes each, until cooked through. Once done, transfer the waffles to a cooling rack.