Grilling Cookies is not my new "Best Thing"

In efforts to get my kids to do their school work each day - yes we are still living in "shelter at home" land as of this writing - I thought making a fun dessert together would be a fun way to end the afternoon. A big giant cookie to bake while we eat dinner seemed fun and easy. I started the oven, both kids happily mixed up the dough, we formed it on the pan and realized the oven was still heating... The week before we'd had an issue where the oven didn't heat up, we restarted it (like the good IT people we are - when in doubt reboot) and it worked. This day? No such love. Sadness!! No delicious freezer meal dinner and no warm gooey cookie. We regrouped - figured out dinner in a another way and called a repairman.
The next night after some suggestions - we tossed our casserole in the gas grill - which worked pretty well, so we did the cookie too. Let's just stay we should have checked on it more than once... because the one time we checked on it - oh man was it burnt. Like almost on fire, burnt, and smoking. The good news was we didn't care, I cut the burnt part off, put ice cream on top and we enjoyed it anyway. It almost tasted like a campfire.
The kids asked if we could try to make this again, sure! Maybe once we have an oven that turns on. Details.

Homemade Cookie Cake Recipe
1/2 cup unsalted butter
1/2 cup brown sugar
1/4 cup granulated sugar
1 large egg
1.5 teaspoon vanilla extract
1/2 teaspoon baking soda
1/4 teaspoon baking powder
1/4 teaspoon salt
1.5 cups all-purpose flour
1 cup semi-sweet chocolate chips (You'll be chopping 1/2 cup and adding the remaining 1/2 cup whole).

Preheat oven to 350 degrees.
Place 1/2 cup of the chocolate chips in a plastic bag and use a rolling pin to break them down into small pieces (set the other 1/2 cup of unchopped chocolate chips aside). The goal here is to have a mixture of tiny chocolate flakes throughout the dough, while still have the whole chunks in there for texture. Once chopped, set aside.
In a small microwave-safe bowl, melt the butter for 20-30 seconds until JUST melted.
Add in white sugar and brown sugar and use a spatula to stir until combined. Add in egg and vanilla, then mix. Next, add in baking soda, baking powder, and salt and mix again. Add in flour and mix until all the flour disappears into the dough.
Add the 1/2 cup of chopped chocolate chips and 1/2 cup of whole chocoalte chips into the dough and mix. Immediately proceed to pressing into pan (you don't want the dough sitting out or it will set too much with the melted butter).
Grease a 12" metal cookie cake pan. Although this cookie removes cleanly, if you are worried about it sticking, line the bottom and sides of the pan with parchment paper first. Using a spoon or your clean hands, drop the dough into small chunks in the pan. This will help disperse everything so that you can easily smooth it out. Once all dough as been added, use a spatula or your hands to press down the dough into a smooth layer (being sure to get all the corners).
Bake at 350 degrees for 12-14 minutes - do NOT overbake or your chocolate chip cookie cake will not be soft. You want the cookie cake to be slightly brown on the top and look slightly underbaked (my oven was perfect at 12 minutes). Remove from oven and place entire pan on a cooling rack. Allow the cookie cake to cool completely before removing.