Add all ingredients except for butter, maple syrup and berries to a blender and blend until just combined.
Meanwhile, heat 1-2 tsp butter in a large skillet. Pour a small amount of batter into the pan to make a test pancake, cooking for about 1 minute per side.
Remove test pancake, then add 2-3 pancakes in the skillet at a time, pouring via a 1/4 cup measure. When bubbles and a firm surface start to form, flip each pancake. This recipe should make about 16 pancakes.
Serve with maple syrup and berries if desired, and store in the fridge between sheets of wax or parchment paper up to 5 days. Alternatively, you can freeze them up to 3 months.
Notes
Serving size is 4 pancakes, not including butter, maple syrup or berries.