What kind of milk should you use in this recipe? Skim, whole, something in between? It's up to you; skim milk will yield the least tender pancake, whole milk the most tender.
If you use fresh berries, mix them right into the batter. If you use frozen berries, it's better to scatter them atop the cooking pancakes. If you mix them into the batter, they'll tint your pancakes a rather unappetizing shade of green.
Why is it helpful to let pancake batter rest before cooking the pancakes? Because it gives the baking powder a chance to start working, and the flour time to start absorbing the liquid, both of which make for fluffier pancakes.
For pancakes with deep blueberry flavour and rich colour, substitute ¼ cup (30g) blueberry powder for ¼ cup (28g) of the flour.