In a large mixing bowl, sift together one and two-thirds of a cup of Bisquick, two-thirds of a cup of rolled oats, two tablespoons of granulated sugar, and one-quarter of a teaspoon of baking soda.
In a separate bowl, mix one cup of plain Greek yogurt, one cup of milk, four tablespoons of melted butter, and two large eggs.
Mix the wet ingredients in with the dry and stir until just combined. Gently fold in one cup of blueberries. Set aside and prepare the blueberry sauce.
o prepare the blueberry sauce, place one and one-half cups of blueberries in a saucepan over medium heat. Add one cup of water, one-half cup of granulated sugar, and one-half teaspoon of vanilla extract. Bring the mixture to a boil. In a small bowl, add one and one-half tablespoons of cornstarch and three tablespoons of warm water. Stir until dissolved and add to the saucepan. Reduce the heat to a simmer once a rolling boiling occurs. Let simmer for two minutes, remove from the heat, and fold in the remaining blueberries.
Preheat a greased skillet over medium heat. (I prefer to use butter). Using a measuring cup, scoop one-third of the batter for each pancake and cook until each side is lightly browned. (Flip when bubbles appear on the surface).
Serve with blueberry sauce, maple syrup, or whipped cream if desired.