PB and J Pancake

1 cup all-purpose flour
1 tablespoon baking powder
1/2 teaspoon salt
2 tablespoons sugar
1 egg
1 cup plus 2 tablespoons milk, plus extra if needed to thin
1/2 cup creamy peanut butter, melted
2 tablespoons oil
4 tablespoons butter
Blackberry Syrup, recipe follows