– 1 cup (2 sticks) unsalted butter, softened
– 1 cup dark brown sugar
– 1 cup granulated sugar
– 3 large eggs
– 2 teaspoons pure vanilla extract
– 2 ½ cups all-purpose flour
– 2 teaspoons baking soda
– 1 teaspoon salt
– 1 cup miniature M&M's
– 24 jumbo (regular size) marshmallows
Preheat oven to 375 degrees F. Lightly grease a 9x13-inch baking pan with nonstick spray. Mix up the cookie base with M&M's stirred in, then press about ¾ of the dough into a 9x13-inch pan. Next, layer 24 marshmallows evenly into the pan in a grid-like pattern, and then scoop the rest of the dough in between each marshmallow (20 dough balls).