I find it easier to make the cream cheese frosting the day before so that it has more time to stiffen in the fridge overnight.
Combine 1 c softened butter with 16 oz of cream cheese. Beat with mixer until well-blended
Add 8 c Confectioners’ sugar and 4 tsp vanilla extract. Beat until smooth
Put half of the cream cheese frosting into a separate mixing bowl. Add orange and yellow food coloring and mix well. Colours will vary with different food colouring products. Mix the colours to get a cheddar cheese-like colour.
Add green food colouring to the other half of the cream cheese frosting to get a lettuce-like colour and mix well
Spoon the cream cheese frostings into separate piping bags and place in the fridge for at least 6 hours to stiffen. Overnight would be optimal I used a straight piping nozzle for the yellow and a star piping nozzle for the green
Make cupcakes as per cake mix box
After the cupcakes have cooled, cover the yellow cupcakes with a cover for an hour to create some moisture on the tops so that sesame seeds can stick-on. If you aren't able to cover the cupcakes, follow the additional instructions in step 10
Slice the cupcakes into halves. For the yellow cake, the top is the top bun and the bottom is the bottom bun. For the chocolate cake, you only use the tops as the burger patty
Sprinkle white sesame seeds to the tops of the yellow cupcakes. If you weren't able to cover the cupcakes to create moisture: brush some warm water on the tops and sprinkle with sesame seeds
To assemble, place the bottom of the yellow cupcake down first
Pipe the green cream cheese to resemble the lettuce
Add the chocolate cupcake top
Pipe the yellow cream cheese to resemble the cheese
Use a knife to spread and close gaps
Use the red cake decorating gel to make lines of “ketchup”
Add the yellow cupcake top
Insert burger pick to prevent the layers from falling over
Serve (with pound cake “fries” optional)