Preheat the oven to 500 F. Line a half-sheet pan (approximately 18-by-13-by-1-inch) with parchment paper and drizzle with 2 tablespoons of the melted butter. Brush the butter to coat the paper and sides of the pan. Set aside.

In a mixing bowl, combine the flour, baking powder, and brown sugar. Whisk or stir to combine the dry ingredients thoroughly.

In a separate bowl; whisk the milk, eggs, remaining melted butter, and vanilla extract until well blended. Add the milk mixture to the dry ingredients and whisk until well blended.

Pour the batter into the prepared baking pan and place it in the oven. Immediately reduce the heat to 425 F and bake for 8 minutes; rotate the pan and continue to bake for 9 to 10 minutes longer, or until lightly browned. If desired, turn the broiler on and broil for 1 to 2 minutes to brown the top crust. Remove the pancake to a rack and sprinkle with chocolate chips.

Slice and serve the pancake with syrup, whipped cream, or honey. Enjoy!