Soften both ice creams on the counter for 15 minutes. In a 9x9 pan, spread vanilla ice cream. Smooth it evenly. Put chocolate ice cream in an 8x8 pan. Smooth it evenly. Freeze overnight or 4 hours.
1
Sift flour, baking soda, and salt into a basin. Set aside.Beat butter, brown sugar, and sugar with a mixer. Beat until frothy in 2 minutes. Add vanilla, egg, and yolk. Combine. Remember to scrape the dish.
2
Slowly add dry ingredients. Mix. Mix in tiny chocolate chips and M&Ms. Chill dough 30 minutes.Preheat oven to 350°F. Parchment two cookie sheets. Scoop dough using a 3 oz cookie scoop. Bake 13-14 minutes.
3
For soft cookies, underbake slightly. Lightly golden edges. Store the other cookie dough balls in the fridge while they bake.Let cookies rest on sheet for 4 minutes. Place on cooling rack. Cooled entirely. Cool cookies in the freezer for 15 minutes.
4
Pair cookies of the same size. Use the same-sized biscuit cutter for the cookies. I used 3.5 and 4 inch biscuit cutters.Ice cream one at a time. Use larger cutter to cut vanilla ice cream.
5
Cut and sandwich ice cream. Freeze the cookies immediately. Repeat with chocolate ice cream. Let sandwiches freeze until firm before eating.
6