Preheat Oven:
Preheat to 350°F (175°C) and line a baking sheet with parchment paper.
Mix the Dough:
In a large bowl, mix melted butter, granulated sugar, and brown sugar until smooth.
Add egg and vanilla, and stir until combined.
Mix in pancake mix until a dough forms. Fold in any optional add-ins.
Scoop & Shape:
Scoop dough into tablespoon-sized balls and place 2 inches apart on the baking sheet.
Flatten slightly with your hand or the back of a spoon.
Bake:
Bake for 9–11 minutes, or until edges are lightly golden.
Cool on the baking sheet for 5 minutes before transferring to a wire rack.