1. Combine first 4 ingredients in a medium bowl, stirring well with a whisk. Weigh or lightly spoon baking mix into a dry measuring cup; level with a knife. Add baking mix and salt to sour cream mixture, stirring just until moistened.
2. Heat a large nonstick skillet or griddle over medium-high heat. Coat pan with cooking spray. Pour about 1/4 cup batter per pancake onto hot pan; cook 1 minute. Sprinkle each pancake with 1 tablespoon blueberries. Cook 1 minute or until edges look cooked. Carefully turn pancakes over; cook 2 minutes or until bottoms are lightly browned. Repeat procedure with remaining batter. Top pancakes evenly with remaining 1/2 cup blueberries.