Place a skillet over medium heat and spray with cooking spray. In a medium bowl, combine flour, sugar, baking powder and salt. Mix well.
In a large bowl, combine milk, egg, butter and vanilla extract. Using a mixer or spoon, mix until creamy. Gradually add the flour mixture, stirring until batter is free of lumps.
Add batter to the hot skillet in 1/4-cup increments. Add a few strawberries, blueberries and sprinkles to each pancake before flipping, about 3 minutes on each side. Remove from heat, repeating the process until batter is gone. (Spray skillet with cooking spray before each new batch.)
Spread butter over warm pancakes and pour syrup over tops.