Preheat your oven to 350°F (175°C) to ensure even baking and a golden color.
In a large mixing bowl, combine the softened butter, granulated sugar, and light brown sugar. Beat with an electric mixer on medium speed until light and fluffy, about 2-3 minutes.
Add the eggs and vanilla extract to the bowl and mix until well combined, scraping down the sides as needed.
In a separate bowl, whisk together the all-purpose flour, corn starch, and baking soda. Gradually add this dry mixture to the wet ingredients, mixing until just combined.
Fold in the semi-sweet chocolate chips gently using a spatula, ensuring even distribution.
Lightly grease your baking dish or cast-iron skillet with non-stick spray or butter to prevent sticking.
Spread the cookie dough evenly into the prepared baking dish, smoothing the top with a spatula.
Bake in the preheated oven for 25-30 minutes, or until edges are golden brown and the center is still slightly soft.
Allow the pizookie to cool for a few minutes, then serve warm topped with a scoop of ice cream and a drizzle of chocolate syrup, if desired.