Instructions
- Preheat the grill to 325°F and brush the grill grates clean.
- Use a mixer fitted with a paddle attachment to mix the butter and sugar together for 3 minutes on medium speed, scraping down the sides of the bowl as needed.
- Add the vanilla extract to the butter mixture. With the mixture running, add the eggs, one at a time, making sure the egg is fully incorporated before each addition. Scrape the sides of the bowl again, making sure to scrap the bottom of the bowl as well.
- Mix the flour, graham cracker crumbs, baking powder, and salt together in a separate bowl.
- Add the dry ingredients to the wet ingredients and mix on medium speed until just combined, then stir in the first amount of chocolate chips.
- Prepare a 9 x 13 baking dish by rubbing it with the melted butter.
- Transfer batter to the pan, pressing the batter down or using a spatula to spread it evenly across the pan.
- Sprinkle the batter with the second amount of chocolate chips.
- Put the marshmallow cream into a pastry bag (or zip-top bag with one corner cut to make a piping bag) and pipe diagonal lines onto the top of the batter.
- Place baking dish on the top shelf of the grill and bake, rotating halfway through, until a toothpick inserted into the batter comes out clean, about 30 minutes.
- Remove the pan from the grill and allow it to cool, before cutting into squares and serving.
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