In a large bowl, combine the all-purpose flour, sugar, cornstarch, baking powder, and salt.
In a small bowl, combine the egg, milk, vanilla extract, and 4 tablespoons of butter, whisking to combine.
Add the wet ingredients to the dry ingredients and mix until combined.
Pour the batter into a rimmed sheet pan prepared with parchment paper and greased with butter.
Jiggle the pan slightly to spread the batter evenly across the pan.
Prepare the chocolate sauce by heating the heavy whipping cream (either in the microwave or on the stove).
Pour the heavy whipping cream over the dark chocolate chips, allow it to sit for a minute or two before stirring until smooth.
Drizzle the chocolate sauce over the pancake mix and use a butter knife to create swirls in the batter.
Sprinkle with the cherries and place in the oven.
Bake for 15-20 minutes, checking the middle with a toothpick to confirm doneness.
Top the pancakes with remaining cherries and chocolate sauce, if desired.
Notes
If using a 9x13" cake pan, make sure to split the batter in half or you will end up with pancakes that are super thick and not cooked through. Pancakes are definitely something we don’t want served half-baked!Running low on pantry ingredients, but have a box pancake mix? Simply follow the box pancake mix and add the chocolate sauce and cherries to it.