Preparation Steps

• Preheat your oven to 350°F (175°C). In a mixing bowl, whisk together the flour, baking soda, and salt. In a separate large bowl, cream the softened butter and both sugars until light and fluffy. Add the egg and vanilla extract, mixing until well combined.
• Gradually blend the dry ingredients into the wet mixture until just combined. Stir in the rolled oats, chocolate chips, and mini marshmallows, creating a deliciously chunky dough.
• Scoop tablespoon-sized portions of the dough onto a baking sheet lined with parchment paper, leaving some space between each cookie. Bake for about 10-12 minutes, or until the edges are lightly golden.
• Allow the cookies to cool on the baking sheet for a few minutes before transferring them to a wire rack to cool completely. Enjoy your warm, gooey cookies!