Beat 1 1/4 cups sugar and 1 stick butter with a mixer until fluffy. Beat in 1 egg and 1 teaspoon vanilla extract. Add the Super-Chunky Christmas Cookie mix (see Cook's Note) and mix until well combined. Scoop big round cookies (about 2 heaping tablespoons each) onto a baking sheet. Bake at 350 degrees until set, about 10 to 12 minutes. Cool on a rack.
Super-Chunky Christmas Cookies Ingredient List: 1 cup toasted shredded coconut 1 cup semisweet chocolate chunks 1/2 cup chopped cashews 1 cup white chocolate chips 3/4 cup red and green M&M's 1/2 cup Dutch-process cocoa powder 1 1/2 cups all-purpose flour 3/4 teaspoon salt 1 1/2-liter glass jar