1. Layer jar in order given: flour, salt, cocoa, and sugar. Secure lid tightly and decorate jar as desired.
Mississippi Mud Cake
1. Preheat oven to 350°.
2. Microwave butter and semisweet chocolate in large microwave-safe glass bowl on HIGH for 1 minute or until melted and smooth, stirring every 30 seconds. Whisk jar cake mix, vanilla, and eggs into chocolate mixture. Pour into greased 15"x10"x1" jelly-roll pan. Bake for 20 minutes; remove from oven and sprinkle evenly with miniature marshmallows and bake an additional 8 to 10 minutes or until golden brown. Drizzle warm cake with Chocolate Frosting and sprinkle evenly with pecans.
1. Stir together first 3 ingredients in medium saucepan over medium heat until butter is melted. Cook stirring constantly for 2 minutes or until slightly thickened. Remove from heat. With electric mixer, beat in powdered sugar and vanilla on medium-high speed until smooth.