Step 1

Line a 9x13-inch pan with parchment paper, with edges hanging over.

Step 2

In a large microwave safe bowl, melt 1 bag of the white chocolate chips, stirring every 30 seconds until melted. Stir in 1 tub of the frosting until evenly combined. Spread evenly into the 9x13 pan.

Step 3

Clean and dry bowl. Melt butterscotch chips, stirring every 30 seconds until melted. Mix in 1 tub of the vanilla frosting. Drop red and yellow food coloring into mixture (about ½ teaspoon of each) and mix until you reach desired orange color. Spread mixture evenly over the white layer in the pan.

Step 4

Clean and dry bowl one more time. Melt second bag of white chocolate chips. Mix in last remaining tub of frosting. Stir in desired amount of yellow food coloring (about ¼ teaspoon is what I use). Spread evenly over the orange layer.

Step 5

Cover and refrigerate until firm, at least 1 hour.

Step 6

To remove from pan, lift parchment paper and flip fudge over onto cutting board. Peel off paper and slice into small squares for serving.