Put all ingredients for the beef cake in a bowl and mix by hand until evenly distributed. Divide the mixture between two pans and press it down into the mold. Bake the pans for 30 minutes at 355°F.
Remove the beef patties from the pans, place one on a large serving plate, and spread a 1-inch thick layer of prepared mashed potatoes over the top.
Sprinkle half of the peas and half of the French fried onions on top of the mashed potato layer. Top with the second beef patty and gently press it down.
First put 4 tablespoons of the remaining mashed potatoes into a piping bag and set aside. Frost the beef cake with the rest of the mashed potatoes.
Use the piping bag to decorate the top of the cake. Sprinkle the remaining peas and French fried onions in the middle of the cake top.
Finally, press the bacon bits on the sides of the cake and your meat masterpiece is ready to eat!