Find a loaf pan that fits the pop tarts, add a little cake batter, then 2 tarts, and keep going until you fill the pan and use 8 pop tarts. Bake about 45 minutes at 25 degrees less than the instructions tell you to.
The frosting is super easy too. Just mix 5 cups of powdered sugar with 2 tablespoons of melted butter and approximately 1/4 cup of milk. Whisk together to form the frosting and add a little more milk if it needs to be more liquidy. Make sure to wait until the cake is cooled to pour this over the top and let it drip down all the sides. Top with some multi colored sprinkles.