You can! The rack helps keep the eggs from colliding with each other and prevents uneven heating of the eggs. But in a pinch you can totally do it without one. Using the rack allows the eggs to steam vs boil. Steaming does still work without a rack but can cause hot spots from contact with the bottom of the instant pot. It doesn't usually cause any significant issues though so if your toddler ran off with your rack don't worry, just move forward with the recipe!