Step 1

Preheat oven to 350°. Bring first 3 ingredients to a boil in a medium saucepan over medium-high heat, stirring often. Remove from heat.

Step 2

Whisk together flour and next 4 ingredients in a large bowl. Add soft drink mixture, and whisk until blended. Whisk in buttermilk, eggs, and vanilla. Pour batter into a lightly greased (with cooking spray) 17 1/2- x 12 1/2-inch sheet pan.

Step 3

Bake at 350° for 18 to 22 minutes or until a wooden pick inserted in center comes out clean.

Step 4

Prepare Fudge Icing, and pour over warm cake. Sprinkle with pecans. Cool completely in pan (about 1 hour).