- Before you begin, take the ice cream out of the freezer and allow it to soften for 10-15 minutes while you make the cookie dough.
- Preheat your oven to 350°F and line a baking sheet with parchment paper.
- Melt butter in a microwave safe bowl, then set aside to cool for 5 minutes.
- Next, in a large mixing bowl, stir together melted, slightly cooled butter, brown sugar, egg, egg yolk, and vanilla extract. Mix until well combined.
- To the wet ingredients, add the flour, cornstarch, baking soda, and salt. Gently fold to combine until no traces of flour remain.
- Pour the M&Ms and mini chocolate chips into the cookie dough and fold until evenly distributed.
- Use a 2 tablespoon cookie scoop to scoop the dough out onto your prepared baking sheet then bake for 8-9 minutes, or until barely golden and glossy on top, then pull them out
- While the cookies are baking, spread the softened ice cream into a 9x13 inch baking sheet lined with parchment paper. Place into the freezer to harden up for at least 30 minutes.
- Allow the cookies to cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely. Once cooled, place into the freezer for 10 minutes.
ASSEMBLING THE ICE CREAM SANDWICHES.
- WORKING QUICKLY! Take the ice cream tray and the cookies out of the freezer. Use a 3 inch biscuit cutter to cut the ice cream into a circle and sandwich it between 2 cookies. Immediately place the M&M cookie sandwich into the freezer and finish the rest of the sandwiches.
*if the ice cream begins to melt before you're done assembling, place it back into the freezer for 10 minutes before finishing.*