1 cup (2 sticks) butter, softened
1 cup sugar
1 large egg
1 teaspoon peppermint extract
2–1/3 cups all-purpose flour
1/3 cup baking cocoa
1 teaspoon kosher salt
1 teaspoon baking soda
1 package (11 ounces) Nestle Tollhouse milk chocolate chips
1 cup marshmallow creme
1 cup finely crushed peppermint candies