01 - Preheat oven to 350°F. Line baking sheets with parchment paper.
02 - In a medium bowl, whisk together flour, baking soda, and salt until well blended.
03 - In a large bowl, beat butter, granulated sugar, and brown sugar until creamy and fluffy, approximately 2-3 minutes.
04 - Add eggs one at a time, beating well after each addition. Mix in vanilla extract until fully incorporated.
05 - Gradually add dry ingredients to wet ingredients, mixing on low speed until just combined. Do not overmix.
06 - Gently fold in mini marshmallows, crispy rice cereal, and white chocolate chips until evenly distributed throughout the dough.
07 - Using a cookie scoop or spoon, drop dough onto prepared baking sheets, spacing 2 inches apart to allow for spreading.
08 - Bake for 10-12 minutes, or until edges are golden brown and centers are just set.
09 - Allow cookies to cool on baking sheets for 5 minutes before transferring to a wire rack to cool completely.